20 inch Dobsonian Telescope construction
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- Опубликовано: 17 июл 2015
- Construction of a 20 inch Dobsonian Telescope by Peter Smith
Music created by Peter Smith aka AstroRambler
Set up for a nights observation at 5:35 minutes in to the video.
The link below is some footage from this 20inch
• Stargazing moments
Links
www.nicholoptical.co.uk/
Full construction blog :
stargazerslounge.com/topic/237... 
Наука
Hi Peter, Awesome Job.. i was wondering how good it would be showing planets and nebulas..i have a 12 inch...wouldyou mind sharing some pics of its observation?
Hi Amit. Many thanks for your positive comment. heres my instagram page. theres some images there taken with my Phone through the eyepiece.
instagram.com/astropete/
I am so envious! I am fascinated by astronomy and would love to build my own telescope with as much craftsmanship as yours. It is absolutely gorgeous!
Nice work . . . I like the idea of it starting out looking like a wheelbarrow then putting it together. I hope it is still serving you well. Thanks for posting this.
This is thing is awesome..Top notch craftsmanship and attention to detail
What a wonderful skill! Fantastic job, mate!
What an absolutely wonderful job! I'm just building a piece just to move my mirror up the tube for better astrophotography and that's a job. Your's blows me away. Enjoy those wonderful views!
That telescope is amazing. Congratulations on the build.
Beautiful piece of art! Hope one day, when I finish mine, looks at least half as good as yours!
Beautiful work,very impressive.
Super creative. Oh... and the music is COOL too!
You're clearly a genius sir, keep it up.
Beautiful. Proper job!
Beautiful job! And I have to say - the music was very interesting.
Congratulations man! Awesome!
This is a lot harder than it looks. Dovetail for the mirror box takes courage my friend, and those side bearings are some of the best looking plywood bearings I have ever seen.
This is amazing! I wish I had the woodworking skills to be able to build something like this!
hello Peter Smith very beautiful and neat his telescope, congratulations!
Clear skies to you sir!
I am amazed that I am just now seeing this post!
I have a Meade Lightbridge 16 that I really enjoy using.
I finally have many of the tools needed to be able to build a scope similar to yours, the bigger the better.
Great video!
Thanks for the Comment. I highly Recommendation this book if you haven't heard of it. www.willbell.com/tm/dobtel.htm
It is truly a great book.
Good luck with your build.
Pete
@@PeterSmithwoodsmith, thanks for the book recommendation!
This is awesome. I just took an optics class and I kinda wanna build one of these one day to apply that knowledge
wow! nice work mate!
That's a beauty of a scope Peter!
Clear Skies! :)
Thank you Markus
Amazing beautiful...congratulations.
Wow! That's a beauty! I would definitely use this video (and the blog of course!) as a guide to build my own one...your telescope looks exactly like my dream one! (I have almost everything ready for mine but, it'll be smaller..."just" 12 inches)
+Juan David Barrada
Thank you Juan. I hope your build goes well.
wow. amazing telescope
Fabulous.
I am inspired...
amazing!
Very nice! I wish I had the woodworking skills to build something like this!
Very interesting video.
Amazing work
Pablo Gabs many thanks.
amazing
Classic Obsession style!
inspirational!
Great job. I have a 16" Nightsky Dobsonian. It is fantastic. The only difficult thing about it, is moving it. I have wheel barrow handles to move it, but it would be nice if I had other options.
what's the website for nightsky dobs? I can't find it via a Google search...
Very nice
Amazing
I am assuming the next step will be to add some form of precision position adjustment to it? Perhaps an Ardunio based servo motor system to allow fine tuning? Should be fairly easy,in theory anyway,to add to such a strong structure?
Woow I think the MOST expensive part of the telescope is the mirror 🤑 with that you must see better than a commercial telescope
Music superb
Hola muy buenas tardes, pregunta, de casualidad no fabricas estos telescopios bajo pedido? para enviar a Miami / Florida?
Fantastic video and awesome music. What genre would you describe it? Gentle house / psytrance / 4am comedown music?
thank you much for the information I plan to keep in touch if ok to do so.
Hi could you tell me the pros and cons between a tube and the frame type? the reason I ask is I was gifted a Dobsonian 10inch that works fine but it had an accident that cracked the tube it has gafa tape on and I did think of buying a tube to make it look better but wondered about putting all the gubbins on a frame like this.
Cheers for any advice plus I looked at your pics, pretty cool and Hadrians wall up my area
LIKE A BOSS.
Intéressante vidéo ☺😊😀
Thank you
That is a work of art. Beautiful. Did you design your own plans or acquire them from someone else. I ask because I'm thinking of building one of these.
Hi SmokeFlame1. I recommend getting a Book called The Dobsonian Telescope (A Practical Manual for Building Large Aperture Telescopes) by David Kriege and Richard Berry.
This is a fantastic book. Those guys build Obsession Telescopes. Also Webster Telescopes are worth a look.
Thank you
The collimation must be very hard on that one
Great stuff would you mind sharing a parts list and maybe drawing?
Thank you Frank. I don't have drawings at hand, but i highly recommend this book. It is all you need to build a great scope.
www.obsessiontelescopes.com/publications/index.php
awesome are you making them now like to buy one
The music is good
where u can buy the mirror ?
dope indian music at the end!
I saw the comment where you stated 'that moment you realize. Wrong way!!' After that I sat and waited for the comment 'Oh... it's CLOUDY' and you then take it all apart but it never came LOL!
Hey Tubedude. Cheers for your comment. The forecast was clear skies that evening and it did indeed clear up. So it wasn't a wasted exercise.
That's great Peter! Hope it has been a good scope for you!
Great job.
How do you find viewing on higher powers. Is it a pain manually tracking all the time?
Hello Dan. I find viewing through higher power eyepiece are dependent on location and atmospheric conditions. I live at about 50 meters above sea level so eyepiece above 10mm on my 20 inch with a focal ratio of 4.2 are not that great. So higher altitudes are better but I drive and have a van so it's a joy to use. In regards to manually tracking, it is large and heavy so it can be a little tricky to manoeuvre when it is pointed straight up at the zenith. But besides that i find it wonderful to use.
can you tell the meassurements of the mirrors which you used.
How much did the supplies cost?
Dude that’s bad ass. How are the views?
Peter fantastic job. Question about the secondary cage. You seem to show some kind of sheet of wood forming the inner cylinder cage. What is that stuff? It seems awful thick to be regular veneer. Did you have to steam it to make the round cylinder?
Hi Chip53 Do. The Secondary cage is made from 3mm (1/8") BIrch Flexiply. Lovely bendy and easy to work with.
Thanks for your reply. I did not know about that bendy plywood. This is great stuff. I can use this stuff for all kinds of other projects now.
Hi, Peter! Can I ask you - how did you mount the secondary mirror onto its base? By gluing it? If so - which type of glue you used?
Hello Magdanoz88
I made an aluminium housing for my Secondary mirror like this - www.astrosystems.biz/sechold.htm
If your secondary mirror is large like mine (4 inches / 100mm minor axis) then a housing is necessary. But if yours is not so big say 2 inches / 50mm then Mirror/glass silicon adhesive will do the job. It is also a good idea to place 2 cocktail sticks between the mirror and the holder with the Silicon. this will keep the mirror parallel to the holder and create a gap that will make it easier to get them apart if you need to replace your Secondary at some point.
stellafane.org/tm/dob/ota/mount-diag.html
Hope that helps
Pete
Hey good job but I was wondering how it is 20 inches it is about 8 feet tall
Brother post some images with this telescope I don’t see any
That scope looks brilliant. Only downside is the need to use a ladder to look through it haha.
thanks for the comment. I dont see that as a down side i love every thing about it. hehehe
I can do naught but envy you, especially if you have good skies to use it under near by.
I can only imagine the views of planetary nebulae through a scope that big!
Could you tell us the specifics of the secondary?
I know this is an old video but can u tell me what the black wrap is that u used on the tubes at the upper cage? Thanks & Clear skies!
Hello and thank you for your comment. That is Flocking. it comes in self-adhesive sheets
Fab presentation and build Peter. Any chance to get plans for the build??
Thank you Denis. I highly recommend this book. It's all you need to build a great scope www.obsessiontelescopes.com/publications/index.php
Thank you for that. Is it possible to reach you via email??
Hey I was wondering from where did you got the mirror. I want to create a 14 inch dobsonian and I don't know where to get them
Hi. It all depends on where you live. I'm in the UK there are several place you can get telescope mirrors here in the UK. I got mine from nichol optical but Orion optics are good too. If you live anywhere else I suggest google searching for Telescope mirror manufacturers in you country.
This is maddening! How come you didn't include pictures taken through the telescope.
Hello Prakhar Gahlot. Sorry the video was rather long already. Here is another video. All the moon footage is through this 20 inch. ruclips.net/video/4rnOLKamBvg/видео.html
how much did u invest in this project?
What do the fans do?
This look like a cannonball
I never would have thought The Hound was into astronomy.
hahaha cheers. i take that as a compliment. Im thankfully not seriously scary.
Lol! Awesome build man.
+1 sub
very well done! if I might ask: what focal ratio did you choose for your 20"?
Martin Bettler hi. Thanks for the comment. The Mirror has a 4.2 focal ratio.
Peter Smith thank you Peter!
your secondary mirror is as big as my primary mirror ahahah
show planets pleas
can i see exoplanets with it lol
Молодец!!!
Thank you
Peter Smith вот мой телескоп old.astronomer.ru/library.php?action=2&sub=2&gid=110
Wow nice Scope. i like the Aluminium Mirror cell. Great build
+Peter Smith thank you very much
Где достать такое главное стекло/ сколько оно стоит?
Two questions: WTF? why the fans? Is there motion control?
Comment: amazing scope dude.
Hi there. The fans are there to cool the mirror. The mirror needs to be at a few degrees above the ambient temperature outside. If I take the telescope out from where I store it and it's much warmer it creates thermal currents which will ruin the view through the telescope. There is no motion control. The scope is used for visual observation. it is possible to motorise it but I have no need for that.
@@PeterSmithwoodsmith Thank you! I'm hoping to start grinding a 10" mirror soon at Chabot Observatory in Oakland CA to make my own Dobber.
Peter Smith can you show a video on what you can see in the telescope
rad telescope. but music to video is too slow
Cost?
Hi, The primary mirror has to be parabolic?
peterdaniel. Indeed yes you are correct. The Primary mirror is Parabolic.
Thanks for your answer!
Sorry one more question. The 20 inch is the diameter of the primary mirror?
peterdaniel 20 inches is the Diameter of the primary mirror.
No pictures from the telescope?
Hello Jason. Here are some Video Clips using my Smartphone through this scope.ruclips.net/video/4rnOLKamBvg/видео.html
300 mm dobson build out of a 300/1500 PDS skywatcher: ruclips.net/video/mcTPAftXxKU/видео.html
A simple image of what it sees would have been nice.
The is a link to a video in the end credits showing what you see through it.
ruclips.net/video/4rnOLKamBvg/видео.html
la media wea.
Congrats
...
ruclips.net/video/Uz5nfjdfb0M/видео.html
Australian
English :)
You sound Australian
over 3000 for a mirror.thats to much
It is alot of money. but if you are really in to your Astronomy. it really is worth it. People spend alot more than that on Cars,Sport,Tv,Stereo,ETC. Ive seen things that really blow my mind through this Telescope.
ruclips.net/video/4rnOLKamBvg/видео.html
music ruins videos
Anyone seeing the clouds? Hit like