Imaging Performance of Telecentric Lenses
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- Опубликовано: 13 сен 2024
- Telecentric lenses eliminate perspective and measurement error, and are ideal for measurement and gauging applications. Watch how the train remains the same size as it moves further away from the lens. Click here to view Telecentric Lenses from Edmund Optics: www.edmundopti...
I've always wondered if there was a way to optically produce an 'orthographic' image in real life
it still boggles my mind that such lenses exist
@@Fruitysfactionme too, I have so many questions
I thought Parallel projection/Isometric view was something only achievable in 3d modeling programs. I am stunned
It's all about perspective! haha jk it's about how light reaches receptors.
think about a bunch of straws glued together. they are all parallel; thus light enters the bunch, but leaves all parallel to one another. this removes perspective, and is essentially what telecentric cameras do. they parallel-ize light input.
I really wish they captured the angled view with the telecentric lens. I know it's the least practical use-case for these but it would have been fun to see.
The RUclipsr applied science brought me here lol
But Stuff Made Here also referenced telecentric lenses.
... a lot of fun for just 8395€ :)
There are many smaller telecentric lenses with smaller field of view size or smaller depth of field that sell for way less. Some high end ones from EO are expensive sure, 2000-6000 USD. But some can be way less, ~600 USD. If you need one for non professional use, try finding a used one or less known brands, maybe. You can find stuff for ~100-200 USD pretty easily.
What is the usual depth of field range for telecentric lenses? Lets say with 30mm field of view? Can it be changed (improved) by changing the iris / aperture? I am confused about your website, I see some lenses that have enormous DOF like +/- 120mm, (240mm total range! wow very useful), but some are less than 1mm DOF. Why? What are the applications and tradeoffs?
Scientific research
amazing you can get really good reference pictures for 3d modeling using these !😯🤯
Exactly my thoughts. I was thinking of making a website where I just go around and take pictures of cars with one of these lenses for free modeling reference
@@gavinplus171 I think the problem with this is that you would need a lens wider than the car you wanted to photograph
@@laurencenoble3629 Yeah I did more research and it doesn't seem really possible like you said. I'm still thinking of just doing the same thing with low distortion conventional optics and using perspective correction in Photoshop to hopefully achieve similar results
@@gavinplus171 you could experiment with photoscanning
@@gavinplus171 As the lens behaves like an orthographic perspective, wouldn't you be able to move a single camera on a 2D grid and stitch the result?
Telecentric lenses have fixed working plane/ distance, right? But in the video we can see quite big depth of field - the train stays sharp while moving forward and backward. Can you change the aperture size of such lens to incerase depth of field?
I think its fixed apeture
I understand the concept but not being able to see certain things like the telephone lines or the people has nothing to do with the lens. It’s just where it’s positioned. No matter which lens you’re using, if an object is in the way of line of sight then it’s still not visible no matter how much you zoom, focus or change the lens
You can see the other lense across from the telecentric shots.
Great demo!
Telecentric lens is sat head on, try angling it now like the foxed focal lens......
I think it is straight, too. It's looking down the center of the scene, like the other lens.
Thank you for this video, it was wonderful
But what if the telecentric lens was in the same position as the normal lense what would it look like
I think it is
It is, but on the other side of the table
Wow, this was fascinating
would it be better to use a Telecentric Lenses on an SLS 3d scanner, or because the image is more flat when using a Telecentric Lenses, it would not work in that application of SLS scanner.
Where is the telecentric lens... ... ...OMG!
It's that huge thing on the other side of the table. They can only see the same width as their opening so it has to be as wide as the scene.
That telecentric lens visible in the background is rather large. Which model of lens is that? It does not appear to be a standard part?
The telecentric lens used is one of our TitanTL Telecentric Lenses! They get quite large and are available as standard parts
How far can it see
Unfortunately only objects 500mm away from the lens and closer will be in focus. Anything further away will get too blurry to see anything
Wow, I would say "probably physically impossible" if I didn't see it :O
What would you see if you took a picture of a very distant object, let's say, the moon? The way I see this lens essentially has infinite Focal length, so, would you see a very zoomed in picture?
No, you cannot focus telecentric lenses at infinity due to...umm...physics (not a lens guy). While all parts of the image appear at their true size, you still have to focus it at a specific distance. Anything not in focus is obv blurry.
@@anamethatisntaken took a while but finally someone cleared it. Thanks!
Very good video! Thank you.
Wow, never knew such thing existed in reality.
but those are only models. A telecentric lens to measure actual trees is going to be implausibly huge and prohibitively expensive! xD
So it's like a real world orthographic lens?
its paraller projection wow
i want this on my canon or smartphone
But the two lenses are at completly different positions and viewing angles of the scene... how is this a meaningfull comparison?
aren't they exactly opposing to each other? I'm not sure either, but otherwise it'll be a useless demo
The scene is almost symmetrical so assembling them in opposition to each other makes sense.
What are they used for? I'm just getting started as a hobby photographer and I'm trying to set up all the knowledge I can.
@@jeremymoorer7033 You will never need a telecentric lenses, the scale of these lenses is 1:1 so the end of the lens has to be the same width as the thing you are tying to take a picture of, it is fixed focal length, fixed apeture, and is used primarily for scientific uses, such as finding measurements, small variations, etc.
@@jeremymoorer7033 so the idea here is to get no difference in magnification, think of it as "Orthographic view" in blender, everything is flat, this is essential to measure stuff, because if something is closer to a normal lens then it will appear larger than a further away object. With a telecentric lens, no matter the distance from the lens (to an extent) 2 objects will appear the same size
Why isn't this used for any sort of astrophotography?
Only objects closer to the lens (in a range of about 400mm) will be in focus. Objects further away would be blurry
@@edmundoptics Oh, that makes sense. Thanks for replying!
How are we making comparisons when both cameras are at completely different angles? Obviously you can see different things, they're not even near the same angle. I don't understand what this is proving.
It proves you have smol brain
In all seriousness they are both the same angle, the difference is that in the normal lense the farther away from the center an object is, the more it will be at an angle, and the further away from the camera the smaller the object will be. You are taking a picture from a single point.
Instead in the telecentric lense all objects are seen from the same angle. Left, right, up, down, close, far, regardless all objects are displayed as the shape and size they truly are.
Imagine like the FOV of a videogame, if the normal lense is 60 FOV, the telecentric lense is a 0 FOV
They're sitting across from each other, you can see the other camera.
You compared two different shots… lol didn’t really make sense but ok
Still struggling to understand how this works lmao