With three types of lenses it is a crap shoot but I always look for them. I have debated just putting an add in the news paper but I already have to linear and two spot lenses so I haven't. The BIG thing to realize is the TV chassis is relatively small. I always break down a TV on site and carry out the smaller pieces. The Chassis is the only thing I carry out on a dolly and that is generally 24 x 40
I lucked out and have a liner lens and the focal point is almost exactly the size of a hot dog. We threw together a frame and took it out for a science project at a local Zoo. We cooked two pack of hot dogs fairly quickly and, if turned right, they came out perfect. Next focus it on a black pipe to distill water. We were boiling water in a small can but I know we can show the kids real water purification. This is a great project.
@@oneangrygoy Thanks for the like. That lens has since cooked hundreds of hotdogs with radiant heat. I also have a few point lenses and let kids melt pennies and then drop the molten metal in another pan so they have a unique souvenir to remind them of the power of solar.
@@koala10ish With money you can have anything made. BUT... they already have the specs for a spot lens. A spot lens can melt pennies quickly but a liner lens spreads the heat more evenly. Just for comparison. I have cooked a few hundred hotdogs on a liner lens because the beam can cover 4 hotdogs almost perfectly. A spot lens would be a circle and the energy would not be even. However anything under a spot lens in focus under 3000º would be obliterated. The sound of aluminum vaporizing let you quickly know you were playing with something that could harm things easily
I have a cook type lens, and I got my 14 inch cast iron skillet up to only 290 degrees. Then I flipped the lens over and got it up to 490 degrees. Seems one side toward the sun is better than the other.
Yes because of the way the lens works a close up drawing would be a better way to understand you see it as a flat sheet with concentric circles feom the edges to the center each ring is round on the outside edge sort of dome and the inside edge of each ring is more flat and angles in toward the the next ring focusing all of the energy into the center the smaller the focus dot the hotter it will be. Now if tou flip the lens it takes a tiny micro dot of light and magnifies it into thw image you see on the screen of that particular type of TV of course.
"You're not gonna know what lens you've got until you break it out, put it in the sun, and have a look." Well, we COULD know, if you'd taken the time to write down which TV each lens came out of, or bother to TELL us if you knew.
This is just amazing stuff! What a practical application of recycled obsolete junk. Saw one of those TVs on the side of the road a few months back. If only I'd seen your vids back then! Can't wait to try this. Thanks for uploading. The instruction video on making the frame will be really helpful too.
Thanks for showing the differences. I was lucky and my first lens was a spot lens from a 90's TV (almost square, wooden frame). It can focus the sunlight to a spot the size of a coin and it's fun to scorch stuff with it, but after 2..3 months of using it I can say it has some disadvantages when it comes to cooking. It can easily destroy glass lids and other materials, it even burst the heat resistant glass panel I dismantled from an old oven (the cover for an insulated box I built). Today I got a linear lens from a newer all-plastic widescreen TV which focuses the sunlight only to a spot the size of a pot. Hope that will be less dangerous for my cooking equipment 😁
@@nickmonk7945 The linear lens is just as good as the spot lens when it comes to cooking, but I still managed to destroy a window glass panel with it. Now I'm using iron cookware and tempered glass and try not to focus it on the glass too much. Only thing that got destroyed from the heat and moisture so far was the wooden box in the 2nd video. By the end of the summer it got warped so much to the point where it became unusable. Next time I will use metal. Spot lens video: "Solar cooking: Boiling eggs with TV Fresnel lens" Linear lens video: "Solar cooking: Bone broth with TV Fresnel lens"
OK - just guessing here. Older Big Screen Projection TVs had a square picture, while newer units have a WideScreen 16:9 aspect ratio. Since the newer ones are wider, I would assume they would need the Linear Lens in order to spread the image across the wide screen. So, I think I'm going to look for older - square-screened projection TVs in hopes of getting a Spot Lens.
They can all be "SPOT LENSES" if you made frames that were tuneable. For example, try pushing in the center of the lens one way or the other and see how it changes the focal point.
@@srussert28 I have one, at first it wasn’t burning so well and I thought it was the bad one, but I flipped it over to see if there was a difference and the light pattern changed, it’s melting metal now, turns out the sides are different
Thanks for this video. I've collected lenses in the past when I used to work for a TV manufacturer. I got rid of them all ): . Now I'm hunting the alleys for them, but at least now I know a little bit of what I'm looking for thanks to you.
Steven Millican Good lenses are from Mitsubishi, Toshiba, and Hitachi from the early to mid-1990s. Look for ones with only composite inputs (red, white, yellow RCA style).Weak lenses in widescreen HD models. Usually, the more square shaped the lens, the better.
I'm assuming fencekid took a bunch of tvs apart and kept the lens and then when he went to test them he discovered there was a difference in their performance and at that point wouldn't know which ones came out of what. I get that since that's the way it would with me.
How munch can you curve the lenz? Can you encapsulate the lens into a small bucket? With a hole in the bottom?? Maybe like a large flashlight with an option on the back to close the lens. This might enable a person to pinpoint Chanel the light and effect, maybe? I just found this process today and am fascinated.
Thank you for making this video. I'm switching things around at home to become more off grid. This is a great idea! In the process of making a food forrest.
The fresnel demonstration explains how I almost cooked at the nus stop. The sun was directed off a building across the street. Some building code discourage that type of building cladding. Enjoyed video. Gave me a few ideas.
I just tore into a rear projection TV that a trucking company near my work was chucking out. Stupidly enough, I ripped straight in not realising how close they are to the surface. But it's barely bigger than the mirror in the back of the tv. I am barely getting anything although only one side got cracked off a few inches in. Its an old LG.
Do you have the model, brand and sizes of the TV's you have scored spot lenses from? would help speed the search for us if we could narrow our searches and decrease gas consumption/time used on TV's with the linear lenses. Great video by the way!
The overhead projector I took apart years ago had a nice fresnel inside. Very hot spot. The projector is now almost a thing of the past in most places, I suppose.
Woo-hoo!!! I might have just scored a dozen of these lenses from my local recycle plant! Guy was very helpful; when I go back on Monday hopefully he'll have them all ready. And hopefully I'll score at least one coin-melter!
phenomenal. guy at work told me about this. all over the em. prep. stuff. lookin' for the right ol' TV now (crap, gave away or sold for zip several over the past 10 years!) thanks!
Great video. Not sure if these are plastic or glass but if they are plastic have you tried bowing the linear ones a bit to see if they will come to a point? It shouldn't take much Just a thought or maybe stacking at 90 degrees spaced just a bit apart? Thanks.
Over a week ago I got a very clear 51 inch linear out of an old Hitachi. Its a perfect candidate fro converting into a spot lens but I am going to leave it as it is
Everyone is asking the same question, what type of TV did the spot lens come from. Either this has been answered 265 comments ago or he doesn't know. It's nice to see which lens do what but "Hope you get a spot lens" doesn't help much when you're dealing with 200 lb tv's.
Go to this video Solar Fried Hot Dogs with a TV lens and you can see the tv it came out of at 1:15 into it. Forget the brand name, but those are the styles to look for.
Nice lense collection !.. My best one is a 36"x 24" spot fresnel and the thing is absolutely vicious. It will drop a 5/8" dia bead at 30" focal point and straight up turns sawzall blades into sparklers.
+Seth Warner I have found that the wooden console type big screens back in the 90s have spot lenses. You can see the TV I'm talking about in my first ever RUclips video Solar Fried Hot Dogs with a TV lens
+Seth Warner I just updated the description box with a link to a vid where you can see the tv it came out of at 1:15 into it. ruclips.net/video/r87SZ3FmXIw/видео.html
+fencekid - I've watched both videos more than once, and if I'm correct, in one of these you say you can't recall what type of tv or exactly which tv you got the best one out of. Meanwhile, can you explain to us all what you mean by a "big screen" tv? Thanks!
yep...got me one last night out of a "Pioneer" 48inch and was screwing around with it in the morning sun..found out the hard way that when you carry it make sure You are between the sun and it,cause if its between the sun and you things kinda get warm . its has a focal point the size of a nickel or quarter..although I wasn't holding it 2-2 1/2 feet away it still got a little warm
Good vs Bad. To give more luminosity to the tv viewer in the center is good. But it is also bad since it removes luminosity from the other tv viewers sitting on the edge of your tv view angle. What is good for a family tv is bad for starting camp fires. What you want to measure are the focal distance and the clarity.
A solar oven use is a great idea, I would think a metal box with the lens on the top. I thought of another great use for this idea, a solar heater for your home! just like the blackened tin can idea with a vent duct going into a window, this would prove to be of great use in very cold regions indeed! What about in a desaltation method? I would think this could make a wonderful mini plant for those who need it, though have to figure separation tanks and evaporative tank.
Seems like it would be a good idea to have one of each, though. The lame one as stated for cooking, warming things or places, etc. You wouldn't have to keep such a close eye on it. Great video!
Question: Who makes the 'spot' lenses? Can you buy them? Secondly is the focal point cone shaped from the lens to the focal point? Thirdly is the energy the same say from the focal point, to 8 inches up? (Same amount of thermal energy, just more displaced?)
Hey brother. Great video. I have a tip to possibly clear up those milkier lenses. Brillianize is an amazing product that polishes all acrylics and plastics. Try it.
What if you take a linear fresnel lens and get some other smaller focusing lens? Because the idea is to bring all the light in the lens area and focus it into the smallest possible point. Well.. focus the linear beam into something smaller. Would it work or I don't know a crap?
yep got my 40" of a rear projection TV must have got lucky it's a beast . not put it in a frame yet it works fine just holding it with a slight bend in it
try to score one of the older wooden console type TVs from the 90s. You have a better chance of finding a sweet spot lens in one of those. good luck bro
Love this..do you still have the video where you show how you build them ? You could teach folks for a small fee how to built them A -covers your bills/time labor cost B -helping community! Lots of folks who are now converting vans to live in year round may find them very useful to use while travelling- alot of folks don't like propane anymore! Ty!
I really appreciate this video. I've been looking for TVs for a while now, but I can't seem to find one that has a good lens. At least now I know why! Thanks!
Are any of these from the older million pound tvs that took up the entire living room? I think they were the first "flat" type screens. They had they rough/wavy pattern like stickers had that changed the image when moved back and forth
Have you experimented adding an offset parabolic mirror under the lenses that produce diffused light pattern? With the right parabola you can focus more light from that 60" than any of the other lenses.
hi, I just acquired a toshiba cinema series and want to use the whole thing. i took the lenses out and will use for many things but I want the lights out as well and I was wondering if you knew what type of fluid is in them ( theres a warning about leakage). Gonna use the body as a stage for puppet shows. Thanks.
I'm going to make one here shortly . i only need low temps to solarize my garden soil. rather than wait six weeks with the traditional method I think I can do it in an afternoon, if I have a good lens. I hope by the time I get it together its one of the better ones for later projects. Is the lens easy to cut? I have a 45" with a crack in it. I want to cut the crack out and use the remainder.
You'll just never know what ya got till you git it in the sun. I can tell you this, my best lenses came out of the older, wooden console type projection TVs. Just think the newer the TV the lamer the lens. The lenses out of both the TVs in my DIY Lens Frame vid sucked. Stay away from black, plastic bodied, newer TVs, and the wide screens won't work at all. Good luck man. Like I said, find a wooden console TV from the early to mid 90s
Brother, if it can focus light like a flashlight, I believe it will become the best weapon. It can burn the camera in 30 seconds, which is more powerful than a laser pen.
Я вас очень прошу, подскажите где достать такую линзу. На каком телевизоре есть такая линза? Какой купить телевизор что бы была такая линза? I ask you, please , tell me where to get such a lens . On what TV has such a lens ? What to buy a TV that there was such a lens ?
Did you perchance note which screen came from what brand or model of television? I'm gonna assume these are rear projection televisions also. Any uses for the color lenses?
+Gene Still I just updated the description box with a link to a vid where you can see the tv it came out of at 1:15 into it. ruclips.net/video/r87SZ3FmXIw/видео.html
I know this was posted quite a few years ago. Do you know where someone could find the large lens like this these days? The smaller ones are easy to find but the larger ones not so much
I found this out myself. I grabbed a 50" Sony fresnel lens and it was a diffused soft light. It would smoke a leaf but not ignite it. I think the better the quality TV, the less desirable the fresnel lens is going to be as the picture was better with the finer fresnel lens.
I saw an ad for a free 36" TV. It said it is big and heavy. Doesn't say if it's rear projection. Do they have to be rear projection to have a fresnel lens?
hey friend, if you're still 'working' on that, you'd get much better result by controlling each 4 corner's offset from the 'average' frame plane anchoring your big plastic lentgh. That way, you would allow the 'screen' to better concentrate solar rays and THEN the screen to spot on more precisely the focal point from sun's rays. Just saying... Have fun
Great video! So, do you have any input on what type of lens and size are good for lighting a fire and cooking, if need be? I'm looking to buy one that's versatile. Thank you in advance.
Hello, im looking for a way to dry soil for crushing can i use a radiant system & letting one of this heat the water also of course using a circulating pump?
I used 600 grit wet/dry sand paper and I sanded the linear grooves out and this took a while doing it by hand but next time I will use orbital sander. When sanding is done I use headlight lens restorer and a dry soft cloth on the orbital sander and it worked well because the point where the light all goes to is the size of a dime. Go to my channel and see the video of the lens melting lava rock
guaporubio No I have never seen a Trinitron Sony Wega lens is it a wide screen lens? I have a couple wide screens and the biggest a 60 incher the lady I got it from does not remember brand of TV it came from. Right now I am on the hunt for either a 65 or 68 inch square lens
I wish I discovered this video 12 years ago when projection TVs were being dumped on a regular basis. My search starts today!
So, can you ask the manufacturers to make one with a perfect spot lens?
With three types of lenses it is a crap shoot but I always look for them.
I have debated just putting an add in the news paper but I already have to linear and two spot lenses so I haven't. The BIG thing to realize is the TV chassis is relatively small. I always break down a TV on site and carry out the smaller pieces. The Chassis is the only thing I carry out on a dolly and that is generally 24 x 40
@@srussert28 Thank you; please send me the link where I can buy both spot and linear lenses!
Same😢
I lucked out and have a liner lens and the focal point is almost exactly the size of a hot dog. We threw together a frame and took it out for a science project at a local Zoo. We cooked two pack of hot dogs fairly quickly and, if turned right, they came out perfect.
Next focus it on a black pipe to distill water. We were boiling water in a small can but I know we can show the kids real water purification. This is a great project.
Can't believe this didn't get a like in 10 years. That sound perfect to me dude.
@@oneangrygoy Thanks for the like. That lens has since cooked hundreds of hotdogs with radiant heat. I also have a few point lenses and let kids melt pennies and then drop the molten metal in another pan so they have a unique souvenir to remind them of the power of solar.
So, can you ask the manufacturers to make one with a perfect spot lens?
@@koala10ish With money you can have anything made. BUT... they already have the specs for a spot lens. A spot lens can melt pennies quickly but a liner lens spreads the heat more evenly. Just for comparison. I have cooked a few hundred hotdogs on a liner lens because the beam can cover 4 hotdogs almost perfectly. A spot lens would be a circle and the energy would not be even. However anything under a spot lens in focus under 3000º would be obliterated. The sound of aluminum vaporizing let you quickly know you were playing with something that could harm things easily
@@srussert28 Thank you; please send me the link where I can buy both spot and linear lenses!
I have a cook type lens, and I got my 14 inch cast iron skillet up to only 290 degrees. Then I flipped the lens over and got it up to 490 degrees. Seems one side toward the sun is better than the other.
Interessant, danke für den Tipp.
Yes because of the way the lens works a close up drawing would be a better way to understand you see it as a flat sheet with concentric circles feom the edges to the center each ring is round on the outside edge sort of dome and the inside edge of each ring is more flat and angles in toward the the next ring focusing all of the energy into the center the smaller the focus dot the hotter it will be. Now if tou flip the lens it takes a tiny micro dot of light and magnifies it into thw image you see on the screen of that particular type of TV of course.
So, can you ask the manufacturers to make one with a perfect spot lens?
Thanks for taking the time to make this video, the knowledge of different types of fresnel lenses is really helpful for a beginner like myself.
I accidentally got one of these lenses out of my old big screen, then I saw your videos... Now I'm glad i kept it.
yeah? which TV was that?
"You're not gonna know what lens you've got until you break it out, put it in the sun, and have a look."
Well, we COULD know, if you'd taken the time to write down which TV each lens came out of, or bother to TELL us if you knew.
Fresnel lenses are the best, I think that!! But I don’t know actually which TV had fresnel Lenses. Any body has Information?
Kids World
I think pretty much any rear projection TV will have some kind of fresnel lens. They’re the big kind that sit on the floor
@The Nech out of 24 TVs I've pulled apart, so far I have 2 spot lenses.
The only ones I’ve ever found were in projection screen TVs
@@DaveSmith-ke5ik Spot lenses from which TVs?
This is just amazing stuff! What a practical application of recycled obsolete junk. Saw one of those TVs on the side of the road a few months back. If only I'd seen your vids back then! Can't wait to try this. Thanks for uploading. The instruction video on making the frame will be really helpful too.
How about old tires, old cans, sand, etc & DIY build a home. Produces food, water, bath, shelter & peace. ruclips.net/video/L3-ubgr96jk/видео.html
Thanks for showing the differences. I was lucky and my first lens was a spot lens from a 90's TV (almost square, wooden frame). It can focus the sunlight to a spot the size of a coin and it's fun to scorch stuff with it, but after 2..3 months of using it I can say it has some disadvantages when it comes to cooking. It can easily destroy glass lids and other materials, it even burst the heat resistant glass panel I dismantled from an old oven (the cover for an insulated box I built). Today I got a linear lens from a newer all-plastic widescreen TV which focuses the sunlight only to a spot the size of a pot. Hope that will be less dangerous for my cooking equipment 😁
Exactly sometimes less is more. It all boils down to your application.
@@cosmicallyderived clever pun, “all boils down “ 😂🤙
So how did it turn out, one year later?
@@nickmonk7945 The linear lens is just as good as the spot lens when it comes to cooking, but I still managed to destroy a window glass panel with it. Now I'm using iron cookware and tempered glass and try not to focus it on the glass too much. Only thing that got destroyed from the heat and moisture so far was the wooden box in the 2nd video. By the end of the summer it got warped so much to the point where it became unusable. Next time I will use metal.
Spot lens video: "Solar cooking: Boiling eggs with TV Fresnel lens"
Linear lens video: "Solar cooking: Bone broth with TV Fresnel lens"
@@tomlauris cool thanks for your reply 👍
OK - just guessing here. Older Big Screen Projection TVs had a square picture, while newer units have a WideScreen 16:9 aspect ratio. Since the newer ones are wider, I would assume they would need the Linear Lens in order to spread the image across the wide screen.
So, I think I'm going to look for older - square-screened projection TVs in hopes of getting a Spot Lens.
8 yrs later ..lol .. curious. What did you find out?
@@Weaton777 for real, did you find out anything?
They can all be "SPOT LENSES" if you made frames that were tuneable. For example, try pushing in the center of the lens one way or the other and see how it changes the focal point.
Ish :)
The theory is spot on though
@@srussert28ur pretty.. punny! 😂
And I definitely agree with your statement. 6 years later.😊
@@srussert28 I have one, at first it wasn’t burning so well and I thought it was the bad one, but I flipped it over to see if there was a difference and the light pattern changed, it’s melting metal now, turns out the sides are different
Thanks for this video. I've collected lenses in the past when I used to work for a TV manufacturer. I got rid of them all ): . Now I'm hunting the alleys for them, but at least now I know a little bit of what I'm looking for thanks to you.
Took four tv's apart before finding a spot lens in a 50" Sony. Kept the others for cooking with the boy scouts.
What year was your SONY? I have a Mitsubishi DLP, WD 60738 model, bought in 2011 - and IDK if I have a Fresnel lens as it is a 60" rear projection TV?
@@myemail9131 I've pulled 3 dlps apart. Non of them were spot
I WOULD BE NICE TO KNOW WHICH TV THE GOOD LENS CAME FROM
Steven Millican Good lenses are from Mitsubishi, Toshiba, and Hitachi from the early to mid-1990s. Look for ones with only composite inputs (red, white, yellow RCA style).Weak lenses in widescreen HD models. Usually, the more square shaped the lens, the better.
I'm assuming fencekid took a bunch of tvs apart and kept the lens and then when he went to test them he discovered there was a difference in their performance and at that point wouldn't know which ones came out of what. I get that since that's the way it would with me.
Thanks for the info jay sun.
I've dismantled two 60" TVs from the early 2000s, and both lenses sucked. The lens from the Sony 1080 HD was the worst.
@@Russell218 Sir what do you mean.. did you removed the the glass of the x ray tube tv screen
Interesting stuff. I've got a linear lens, but it's mounted in a curved frame so the lens itself is bent, giving it a pretty concentrated focal point…
How munch can you curve the lenz? Can you encapsulate the lens into a small bucket? With a hole in the bottom??
Maybe like a large flashlight with an option on the back to close the lens.
This might enable a person to pinpoint Chanel the light and effect, maybe?
I just found this process today and am fascinated.
I can see a lot of potential uses for these . Thank you for sharing this
Thank you for making this video. I'm switching things around at home to become more off grid. This is a great idea! In the process of making a food forrest.
The fresnel demonstration explains how I almost cooked at the nus stop. The sun was directed off a building across the street. Some building code discourage that type of building cladding.
Enjoyed video. Gave me a few ideas.
Have you ever compiled a list of which brands tend to have the better lens, or which models?
+Shawn Hawkins I used to sell those TV's and the diamond series . I'm old . lol
I dismantled a Sony KDS-60A2020 today and the lens is poop. Even polishing the backside won't make it fully transparent.
I just tore into a rear projection TV that a trucking company near my work was chucking out. Stupidly enough, I ripped straight in not realising how close they are to the surface. But it's barely bigger than the mirror in the back of the tv. I am barely getting anything although only one side got cracked off a few inches in. Its an old LG.
Do you have the model, brand and sizes of the TV's you have scored spot lenses from? would help speed the search for us if we could narrow our searches and decrease gas consumption/time used on TV's with the linear lenses. Great video by the way!
Did you ever find one a decade ago?
@will 😄
Wow, this video was 12 years ago. If you are still around and remember, what model of the TV that second Fresnel lens was from?
It also appears that your best lens is also a lot clearer too. The others looked hazy at least on the video.
The overhead projector I took apart years ago had a nice fresnel inside. Very hot spot. The projector is now almost a thing of the past in most places, I suppose.
Woo-hoo!!! I might have just scored a dozen of these lenses from my local recycle plant! Guy was very helpful; when I go back on Monday hopefully he'll have them all ready. And hopefully I'll score at least one coin-melter!
phenomenal. guy at work told me about this. all over the em. prep. stuff. lookin' for the right ol' TV now (crap, gave away or sold for zip several over the past 10 years!) thanks!
The moral of the story that he forgot to note what TV get the good lens from.
Great video. Not sure if these are plastic or glass but if they are plastic have you tried bowing the linear ones a bit to see if they will come to a point? It shouldn't take much Just a thought or maybe stacking at 90 degrees spaced just a bit apart? Thanks.
thinking outside the box
Over a week ago I got a very clear 51 inch linear out of an old Hitachi. Its a perfect candidate fro converting into a spot lens but I am going to leave it as it is
Good info! Wish we had a list of good sources
What if you added a little concave to the one with the line to help focus?
That wont work, it will change the shape of the focus point but not alter the consecration point much, tried it today.
That's good to know. thx for putting it to the test and posting results. Maybe for cooking the shape may benefit?
Everyone is asking the same question, what type of TV did the spot lens come from.
Either this has been answered 265 comments ago or he doesn't know.
It's nice to see which lens do what but "Hope you get a spot lens" doesn't help much when you're dealing with 200 lb tv's.
Go to this video Solar Fried Hot Dogs with a TV lens and you can see the tv it came out of at 1:15 into it. Forget the brand name, but those are the styles to look for.
fencekid Cool., thanks.
fencekid Would you sell your lens and frame set ups?
Nice lense collection !..
My best one is a 36"x 24" spot fresnel and the thing is absolutely vicious. It will drop a 5/8" dia bead at 30" focal point and straight up turns sawzall blades into sparklers.
The spot lens looked really clear like glass... Do you think that might be a good way to tell what you've got?? I gotta get me one of these!
Great video. Over and beyond.
Very helpful.
Although I would like to know how one could look for clues as to which TV has what?
Awesome info and great job, thanks. Can you tell us which tv you got the clear lens from so we may be on the look-out for that particular one??
ok man, maybe you should have kept track of what brand TV was the best!
+Seth Warner I have found that the wooden console type big screens back in the 90s have spot lenses. You can see the TV I'm talking about in my first ever RUclips video Solar Fried Hot Dogs with a TV lens
+Seth Warner I just updated the description box with a link to a vid where you can see the tv it came out of at 1:15 into it. ruclips.net/video/r87SZ3FmXIw/видео.html
+fencekid - I've watched both videos more than once, and if I'm correct, in one of these you say you can't recall what type of tv or exactly which tv you got the best one out of. Meanwhile, can you explain to us all what you mean by a "big screen" tv? Thanks!
+Escape From NY the tvs these come from are back projection tvs. if that's what you mean.
That was really amazing. I saw the framing, the awesome spot lens and I can't wait to watch the actual cooking!
yep...got me one last night out of a "Pioneer" 48inch and was screwing around with it in the morning sun..found out the hard way that when you carry it make sure You are between the sun and it,cause if its between the sun and you things kinda get warm . its has a focal point the size of a nickel or quarter..although I wasn't holding it 2-2 1/2 feet away it still got a little warm
did you burn your peepee?
Never knew ppl were so into TV lenses. Now I want one
Thanks. I'll see how it goes. Looking for more of them to scoop up.
Would it work if you placed one lense on another lense? I wonder if there's a sweet spot that could improve the performance of the bad ones.
Good vs Bad. To give more luminosity to the tv viewer in the center is good. But it is also bad since it removes luminosity from the other tv viewers sitting on the edge of your tv view angle. What is good for a family tv is bad for starting camp fires. What you want to measure are the focal distance and the clarity.
Does anyone know of a list giving the best chance of finding a focal lens from what make and model tv?
Got my lens out of a slide projector, much smaller than yours from TV, but still very powerful.
What brand was the projector?
You should have noted which lens cam from which brand of TV, so you could pass that info along.
Great video and what about this? On the "crappy" lenses how about a slight bend in the frame to try and tighten up the line you were getting?
A solar oven use is a great idea, I would think a metal box with the lens on the top. I thought of another great use for this idea, a solar heater for your home! just like the blackened tin can idea with a vent duct going into a window, this would prove to be of great use in very cold regions indeed! What about in a desaltation method? I would think this could make a wonderful mini plant for those who need it, though have to figure separation tanks and evaporative tank.
I wonder if you could use the less powerful lens to use at your home Windows to heat up your home.? can you do a video on that?
Seems like it would be a good idea to have one of each, though. The lame one as stated for cooking, warming things or places, etc. You wouldn't have to keep such a close eye on it. Great video!
Question: Who makes the 'spot' lenses? Can you buy them?
Secondly is the focal point cone shaped from the lens to the focal point?
Thirdly is the energy the same say from the focal point, to 8 inches up? (Same amount of thermal energy, just more displaced?)
Hey brother. Great video. I have a tip to possibly clear up those milkier lenses. Brillianize is an amazing product that polishes all acrylics and plastics. Try it.
What if you take a linear fresnel lens and get some other smaller focusing lens? Because the idea is to bring all the light in the lens area and focus it into the smallest possible point. Well.. focus the linear beam into something smaller. Would it work or I don't know a crap?
Thanks for sharing this side by side...very good info.
Excellent information and research friend.
couldn't you find out what makes them good and then look for that spec in the right models? thanks for uploading
Thank you sir.. I thought I had done something wrong… you answered all my questions…
Also great video it helps anyone trying to find treasures in another person's trash
Thanks for the info, good to know when I go hunting. And nice shirt!
I like this guys style
yep got my 40" of a rear projection TV must have got lucky it's a beast .
not put it in a frame yet it works fine just holding it with a slight bend in it
What brand did it come from?
try to score one of the older wooden console type TVs from the 90s. You have a better chance of finding a sweet spot lens in one of those. good luck bro
Any idea if an RCA 42" TV Model: p46920bl lens is a spot lens? Any information would be appreciated greatly! The screen looks pretty square.
nice vid, LOVE THE SHIRT!!
Its great for cookin' !
Love this..do you still have the video where you show how you build them ? You could teach folks for a small fee how to built them
A -covers your bills/time labor cost
B -helping community!
Lots of folks who are now converting vans to live in year round may find them very useful to use while travelling- alot of folks don't like propane anymore!
Ty!
I loved your impression of Donald Jr. on SNL.
Did you try turning the "bad" lenses around, or flipping them over? The one that I have works differently depending on its orientation.
"It'll melt liquid" haha
thanx for the cool comment man, that shirt, I picked up on amazon. One of my faves
Can you tell us which tv's had the best lenses?
I really appreciate this video. I've been looking for TVs for a while now, but I can't seem to find one that has a good lens. At least now I know why! Thanks!
I like this guys reaction lol
Wooooooooooohoooooooooooooo
Hi!
What advises can you give, when buying A4 size fresnel lens from Ebay? Will it be any good if it's linear?
Thank you!
Do the newer flat screens have a fresnel lens. People are already tossing them here. I have made a few into light boxes . Thanks
Do you keep track of manufacturers and model numbers of the TV's each one comes out of.
Might be a name brand difference. The one I got from a Sony 65 inch tv is a cooking/linear type. Still fun as heck to play with.
Did you try a page magnifying Fresnel at the soft focal point to achieve a sharper focus?
Are any of these from the older million pound tvs that took up the entire living room? I think they were the first "flat" type screens. They had they rough/wavy pattern like stickers had that changed the image when moved back and forth
Excellent video.
if you used the 'line' focus lens on a length of black pipe, would it get hot enough for a water heater?
Have you experimented adding an offset parabolic mirror under the lenses that produce diffused light pattern? With the right parabola you can focus more light from that 60" than any of the other lenses.
Good effort there. I wonder what company uses the best spot fresnel lens's ?
tx.
hi, I just acquired a toshiba cinema series and want to use the whole thing. i took the lenses out and will use for many things but I want the lights out as well and I was wondering if you knew what type of fluid is in them ( theres a warning about leakage). Gonna use the body as a stage for puppet shows. Thanks.
+Darrell Anderson I know you asked 3 months ago but if you didn't figure out by now it's either mineral oil or glycerin
I'm going to make one here shortly . i only need low temps to solarize my garden soil. rather than wait six weeks with the traditional method I think I can do it in an afternoon, if I have a good lens. I hope by the time I get it together its one of the better ones for later projects. Is the lens easy to cut? I have a 45" with a crack in it. I want to cut the crack out and use the remainder.
I just want to cook. Melting point is for something else. Thanks for the demo. Cool.
couldn't you bend the lenses with a linear focus a bit in a new frame to make it into a spotlens?
I can't help but wonder if flexing the one's that are not spot lense can change it to a spot lense?
You'll just never know what ya got till you git it in the sun. I can tell you this, my best lenses came out of the older, wooden console type projection TVs. Just think the newer the TV the lamer the lens. The lenses out of both the TVs in my DIY Lens Frame vid sucked. Stay away from black, plastic bodied, newer TVs, and the wide screens won't work at all. Good luck man. Like I said, find a wooden console TV from the early to mid 90s
Brother, if it can focus light like a flashlight, I believe it will become the best weapon. It can burn the camera in 30 seconds, which is more powerful than a laser pen.
What happens if you double two lenses at different distances apart?
Я вас очень прошу, подскажите где достать такую линзу. На каком телевизоре есть такая линза? Какой купить телевизор что бы была такая линза?
I ask you, please , tell me where to get such a lens . On what TV has such a lens ? What to buy a TV that there was such a lens ?
Did you perchance note which screen came from what brand or model of television? I'm gonna assume these are rear projection televisions also. Any uses for the color lenses?
+Gene Still I just updated the description box with a link to a vid where you can see the tv it came out of at 1:15 into it. ruclips.net/video/r87SZ3FmXIw/видео.html
I know this was posted quite a few years ago. Do you know where someone could find the large lens like this these days? The smaller ones are easy to find but the larger ones not so much
I found this out myself. I grabbed a 50" Sony fresnel lens and it was a diffused soft light. It would smoke a leaf but not ignite it. I think the better the quality TV, the less desirable the fresnel lens is going to be as the picture was better with the finer fresnel lens.
Thank you for this great info on the lens.
I saw an ad for a free 36" TV. It said it is big and heavy. Doesn't say if it's rear projection. Do they have to be rear projection to have a fresnel lens?
Correct. Rear projection TVs are what you are looking for. It sounds like the big and heavy TV may be an old CRT TV.
what type or brand of tv's did you get the most concentrated tvs from ? the most clear fresnel lens ?
hey friend, if you're still 'working' on that, you'd get much better result by controlling each 4 corner's offset from the 'average' frame plane anchoring your big plastic lentgh. That way, you would allow the 'screen' to better concentrate solar rays and THEN the screen to spot on more precisely the focal point from sun's rays. Just saying... Have fun
Great video! So, do you have any input on what type of lens and size are good for lighting a fire and cooking, if need be? I'm looking to buy one that's versatile. Thank you in advance.
"Watch it. Woh WOH BAAAAM! I mean insta, i mean you can draw with it." 4:20
Hello, im looking for a way to dry soil for crushing can i use a radiant system & letting one of this heat the water also of course using a circulating pump?
I recently sanded and polished a linear lens into a spot lens and now it melts rock in no time at all.
How did you polish it
I used 600 grit wet/dry sand paper and I sanded the linear grooves out and this took a while doing it by hand but next time I will use orbital sander. When sanding is done I use headlight lens restorer and a dry soft cloth on the orbital sander and it worked well because the point where the light all goes to is the size of a dime. Go to my channel and see the video of the lens melting lava rock
+Michael Ellestad Did you ever polish out a lense from a Trinitron Sony Wega?
guaporubio No I have never seen a Trinitron Sony Wega lens is it a wide screen lens? I have a couple wide screens and the biggest a 60 incher the lady I got it from does not remember brand of TV it came from. Right now I am on the hunt for either a 65 or 68 inch square lens