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Telecentric Lens Design Explained!
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- เผยแพร่เมื่อ 7 พ.ย. 2023
- See what makes a lens telecentric, causing objects to always to appear the same size to it no matter how far away they are! #optics #stem #telecentric #science #lensdesign #imaging
The photographer: telecentric
Me, the CAD/3D Model/Render enthusiast: orthogonal
Telecentric lenses give you an orthogonal view of real life!
As a blender/freecad user I think of Orthographic. I didn't know there were so many different words for it
@@andrewmccarty orthographic is the technically correct word for that view. Orthogonal just means perpendicular to. I suppose an orthographic camera could be perpendicular to a CAD model’s face, but I don’t think that orthogonal necessarily implies orthographic.
I used to imagine our eyes working like this as a kid and it freaked me out
Yeah that'd be pretty wild!
We'd be ded
Love your music
didn't expect orthogonal can even be emulated in real life
Yeah it's pretty wild!
It's not emulation though
@@Ebanione thing trying to imitate another is emulation.
@@Rose_Harmonic It's not trying to imitate anything, you're just comparing them, doesn't mean they're related. Next time just think a little
@@Ebani you think these things are unrelated? Wtf
This is insanely interesting! If there's no parallax I wish I could use it for creating panoramas! It would save so much work 😆
Then if the panorama would be exactly as tall as the diameter of the lens lol. So you won't see trees or even people but just a 20cm tall panorama.
@@joseph2a3733They can obviously be designed for other focal lengths and whatever you wanted. As long as you can pay for it. 🤑
You are still also going to come across motion paralax from moving the camera to create the panorama regardless of what lens you use
Yeah the panorama is gonna be the same height as your lense
@@joseph2a3733 giant lens
I've always been wondering if it's possible to create orthographic or isometric camera IRL. Well, it is
Game developers minds are broken
@@DaddyFrostynot a big deal, but we can imagine normals, framebuffers and wrap textures around ourselves
I’d be interested in seeing what portraits look like with a telecentric lens. I’ve done portraits with a wide angle lens and they look terrible because they accentuate the depth of facial features. Mild telephoto lenses are normally used for portraits because they compress / flatten depth.
A telecentric lens, of course, has no depth. If you have any *larger* ones you should try that. :)
We show that in some past videos! You briefly see a face through the lens at the end of th-cam.com/users/shortsEBbBFK1Q1rA
They wouldn't look too unusual, its like zooming in on faraway objects, it washes out their depth. This lens allows to achieve that effect from up close.
So basically it's a document scanner, but a camera lens. Cool!
i used eo telecentric lenses about a decade ago at a former employer. pretty sure it was a custom design. very impressive piece of glass. my part of the challenge was generating enough light to freeze motion in a very short exposure period and a heavily stopped down lens.
Awesome! Yeah getting enough light throughput can be a big challenge at very short exposure durations
i’m yearning to see this lens put on any sort of camera with a decent frame rate/ shutter speed !
Aww, that poor lens! He killed it! 😰
Camera is irl isometric mode
what happens if you pointed out to the moon?
Unfortunately, objects will only be in focus in a fixed range close to the lens and anything further away will be blurry. SO you can't see a little patch of the Moon in focus
Also even if that lens could focus to infinity you'd have to mount that camera on an insanely precise and stable star tracker, otherwise the moon would be flying by the frame at immense speed and you'd have crazy motion blur anyway 😅
@@edmundopticsIs there a limit on how far away you can make the fixed range? Could you do anything at least comparable to telephoto lenses?
Wow I hadn't heard of this before but that is really cool, so basically this stops parallaxing?
Yes exactly! These lenses are great for industrial inspection, where the size of parts on a moving conveyor belt can be accurately measured without parallaxing
I didn’t even imagine this was optically possible
It is not.
@@obvioustruth it obviously is
I saw something like that used in shows to capture the dancers and signers everywhere on the stage without having to zoom in and out. Sometimes it seams like the signer is just beside the dancer but they are far apart. One place I saw this is at a 50 cent's show. The camera lent was huge.
It could definitely have been a telecentric lens like this one, but if it was fully telecentric the lens would have to be as big as the dancers! These can only see objects as large as the front of the lens, so maybe that was a semi-telecentric lens
@@edmundoptics Yes, The lent was like as big as two heads so it had to not be completely telecentric. They probably measured the average stage depth and ensured that it's pretty much telecentricish for that range.
How would this work on öonger distances? Fo you just loose detail the further away things get?
Very cool. At what distance does the effect break down? I assume you cant use it to, for example, take-to-scale images of moon rocks from Earth?
So why are you using a 5fps 240p webcam with that lens then?
I need to see some outdoor shots as blurry as they might be
id love to see how well this lens can see at a large distances
Unfortunately, only objects in a fixed range close to the lens will be in focus. Things further away will be too blurry to see anything, so you couldn't see a tiny patch of the Moon with a telecentric lens
So does that mean you could look at a star and see like 10 square inches of it's surface? I'm guessing the inverse square law (does that apply to light, or just sound?) would probably make that pretty dim, but with a bright enough source, does it have literally infinite range?
The inverse square law applies to brightness through the lens, but more importantly it only has a limited depth of field close to the lens where objects are in focus. Things further away become too blurry to see anything, so you couldn't see a little patch of a star or the Moon with a telecentric lens
Im a bit confused. If you put this lens in space, what would you see?
So.. how far can it see? What would objects over 100 feet away look like?
Unfortunately, only objects closer than 500mm or so will be in focus. Things further away will be too blurry to see anything
what is max distance? before you get degradation of image?
About 500mm away
Is the audio slightly out of sync?
Absolutely wild. Trying to think of an excuse to own this as a photographer 😂 does it still have depth of focus or is everything in focus all the time?
Yeah they are! Unfortunately, they do have a depth of focus and objects will only be in focus in a fixed range close to the lens. Anything further away will be blurry, so you can't see a little patch of the Moon in focus
So....... what would happen if you point it at the moon? I know it's to crude to get a sharp image as a hair of over that distance would become a building sized error. Still what would you see?
Unfortunately, only objects in a certain range close to the lens will be in focus, while things further away like the Moon will be too blurry and dim to see anything
shine a bright flashlight through it from where the sensor normally would be. Real life BATMAN SIGNAL !!!
So what if you point it at something far away? Like the moon?
Unfortunately only objects in a certain range close to the lens will be in focus, so things further away like the Moon will be too blurry and dim to see anything
Just wondering the range on one of these. And why they aren't being used in space or to operate plannets.
Unfortunately, only objects in a certain range close to the lens will be blurry, and objects further away will be too blurry to see anything. So we can't see a tiny patch of Mars in focus with one of these. That specific aperture location requirement for telecentric lenses prevents them from having a really extended depth of field that lets them see very far away
A lens the size of a nuclear warhead? Who they gonna get to carry it for you? Andre the Giant?
What is a practical application of this lens, please?
Mainly factory automation, like quickly and accurately measuring the size of parts on a moving conveyor belt in an automated factory
Video/ digital optical comparator has entered the chat
This must contain clues for avoiding dual-vector foil attacks 🤔
I thought that was a kinetic armor penetrator round for a second
Since objects appear the same size at any distance, there’s no need for zoom. What would distance objects look like. Could it be used for spying? Could you see rocks on the moon?
Unfortunately only objects in a certain range close to the lens will be in focus, and anything further away will be too blurry to see anything. So you can't point this at the Moon and see a tiny part of it in focus
What's the use case for this?
Amazing
Thanks!
is it real time or does it always lag?
That's just a result of the camera being used instead of the lens. It's a camera for automated factories, not the consumer cameras we're used to
“What devilry is this?”
Magic, also known as science
That's similar to how mirrors don't change the size of our face when we move away from it
boy do I want one of these for kicks but they are like mucho expensive for some reason. There oughta br some collection of cheap lenses you could put in a 3d printed holder to get a decent home gamer one.
I forgot the name of the material that can do this. the one that only allows light to go through it at a perpendicular angle
But what is it used for
Mainly industrial inspection, like quickly and accurately measuring the size of parts on a moving conveyor belt in an automated factory
So it’s like a reverse laser?
So coincidental, I was just thinking about the other end of that. convexing multiple parallel laser beams to a focal point and then concaving them to a single tiny parallel beam.
That's actually done a lot! Devices called beam expanders do this, where a laser beam enters in at one diameter and leaves with a different diameter (usually larger, but it can be used in reverse to make beams smaller). This is also the basic principle behind how telescopes work
What happens if you take it outside? Is it like you can see infinity?
Unfortunately, only objects in a certain range close to the lens will be in focus. Anything further away will be too blurry to see. So you can't point this at the Moon and see a little patch of the Moon in focus
1 to 1 magnification?
You can get these telecentric lenses in a variety of different magnifications, but the apparent magnification of objects won't change with distance like it normally does
What happens if you point it at the moon?
Unfortunately, only objects in a fixed range close to the lens will be in focus. Things further away will be too blurry to see anything, so you couldn't see a tiny patch of the Moon with a telecentric lens
I knew someone like that once.
Mirrors do the same thing, maybe one could simplify the design?
Holy crap, I've been trying to understand telecentric lenses for months, and unfortunately I still don't, but how did you get your hands on that thing 😂 aren't those like thousands of dollars?
Yeah this one costs about $11,000 USD! We actually make these
@@edmundoptics Wow sweet! That's awesome
Why can’t this be used to look at incredibly fine details on far away planets, I know it would be hard to constantly adjust it due to the planet’s movement but there must be a way?
this is crazy. i can barely wrap my head around it. i wonder if it wojld theoretically be possible for an animal to have a lens like this in their eyes
We currently don't know of any animals with telecentric vision, but that would be pretty crazy!
So no aberrations?
Yes, there are unfortunately still some amount of aberrations
That logo on your shirt I've seen it before
It's the Under Armour logo! And then our company logo
. . _WHY_ does that work that way‽
Does it work in reverse? Make a really straight flashlight beam?
In some of our other videos we show that light coming in from really far away is focused down to a lens' focal point. Telecentric lenses basically do that in reverse. By placing the aperture that limits how much light is let into the lens at the focal point of the lenses that came before it, that aperture is projected infinitely far away. That cause that cylindrical, constant field of view coming out of the lens. And yes, telecentric lenses are sometimes used in reverse as big, even illuminators! Those are great for industrial inspection as well because they let cameras get really sharp contrast around the edges of objects
@@edmundoptics what I'm not understanding is how limiting how much light at a focal point results in everything being projected as if it were at infinity.
Also
My intuition telling me it would just reduce image intensity.
what happen if you point it to the moon?
Unfortunately only objects in a certain range close to the lens will be in focus, while things further away will be too blurry to see anything. So you couldn't see a tiny patch of the Moon with this
How far can such lenses focus
Unfortunately not very far away, about 500mm
@@edmundoptics just imagine if they could focus as far as regular lenses hahahah
@@edmundoptics also, do these lenses have a focal length
Yeah that would be incredible! And yes, they do still have a fixed focal length
Shine a powerful flashlight through it.
perfect for a rear view mirror in a car
Maybe a little bit of overkill 😀
Point it at Vulcan. See if Spock looks the same size
It is create an orthogonal like image 😮
Exactly!
What happens if we point it at the moon
Unfortunately, only objects in a certain range close to the lens will be in focus. Anything further away will be too blurry to see anything, so you couldn't see a tiny patch of the Moon in focus with this
Is this aperture science?
They made orthoganal projections IRL??
Yes! 😀
The paper trick brake my brain
Same
It just like me fr!!
You should try look at something far away
Unfortunately, only objects closer than 500mm or so will be in focus. Things further away will be too blurry to see anything
@@edmundoptics oh right that makes sense
Why is it called telecentric but not orthographic?
Some subtle differences are that a lens can be telecentric on both sides of the lens, while "orthographic" just refers to being telecentric on the side looking at the objects. In this case they're the same thing, but some lenses can be telecentric on the image side (meaning that you have this same parallel bundle of light going to the image sensor) while some lenses that are telecentric in terms of the object they're looking at aren't telecentric in terms of the image side. They essentially mean the same thing, but there's that 1 difference and they're just different terms used in different fields
Take a picture of the moon with it!
Unfortunately, only objects in a certain range close to the lens will be in focus. Things further away will be too blurry to see anything
what if u look at stars
Unfortunately, only objects in a certain range close to the lens will be in focus. Anything further away will be too blurry to see. So you can't point this at a star and see a little patch of it in focus
@@edmundoptics thanks for responding, that makes sense, do objects appear just as big as they are relative to the size of the opening, if thats true, my logic was that the stars would appear that big too which would be a crazy telescope. my new question is, when pointed at the stars, do u just see blurry and dark sky?
@Aqua2D yeah if you could see stars with this you'd just see a tiny patch as big as the lens, but it'll be way too blurry amd dim to see anything
Thanks for explaining it... but why?
Like why are these lenses made? They're great for industrial inspection, like quickly and accurately measuring the size of parts on a moving conveyor belt in an automated factory
Possible to make as a scope? Would be interesting to see that in practice.
Unfortunately these lenses can only see objects in focus if they're in a certain range close to the lens. Objects further away will be too blurry to see anything, so it'd make a pretty lousy scope
I like your funny words magic man
Science = magic
I interested in why we can not see Apollo landing with a telescope .They say we need a telescope biggest like earth .
It's a result of something called the diffraction limit, which limits the resolution that any optical system can achieve. Seeing objects that small on the Moon from the Earth would require a resolution higher than the diffraction limit, which is impossible. It's the same principle why a normal, light-based camera can't image individual atoms
So we can see at the edge of our milky way galaxy
Unfortunately not 😢 only objects in a certain range close to the lens will be in focus. Things further away will be too blurry to see anything
@@edmundoptics we can actually made this more perfect...........bys using only parallel rays to create an image on sensor
Do any animals have these kinds of eyes?
No not that scientists know of!
Yo, I think I may have this but with my vision. Suddenly woke up with eyes seeing different. My phone is appears the same size whether I move it closer or farther away
So like a fixed point, shift point lense. Same dif.. but fixed instead of adjustable angle of view. Weird. Seemes limiting for whatever that costs.. lol.
Now test the Range on it
There is a fixed range close to the lens over which objects will be in focus. Objects will start to get blurry if they're more than about 500mm away
One inevitable shortcoming is that the further away you are the dimmer the image must become.
True, plus unfortunately only objects in a certain range close to the lens are in focus, with things further away becoming too blurry to see anything. So you can't see a little patch of the Moon through this
thats a reverse laser :D
isometric/orthographic camera 0.0
So that would mean the lens needs to be the same size as the subject? Meaning to take a picture of a person the lens would need to be the size of a person! 😲
Exactly! That's why we don't have telecentric images of people or buildings
Optics gives me a headache.
So it's basically isomorphic.
This type of view is often called orthographic!
I want one
We sell them on our website 😀
Such lenses are impossible! If they existed, practically you could see 5cent coin from the edge of universe.
Unfortunately, only objects in a fixed range close to the lens will be in focus. Things further away will be too blurry to see anything, so you couldn't see a tiny patch of the Moon with a telecentric lens.
But telecentric lenses are quite real and are used all of the time in industrial inspection, like quickly and accurately measuring the size of parts on a moving conveyor belt in an automated factory
let's see the Moon through it!
Unfortunately, only objects in a certain range close to the lens will be in focus. Things further away will be too blurry to see anything. So we can't point this at the Moon to see a tiny patch of it in focus
point it at a star
Unfortunately only objects in a certain range close to the lens are in focus, with things further away becoming too blurry to see anything. SO you can't see a little patch of a star through this
it's fake right?
Nope! Telecentric lenses like these are used a lot in industrial inspection, like quickly and accurately measuring the size of parts on a moving conveyor belt in automated factories
Telecentric? More like Hella-centric, bro.
Wild
Yeah it is!
isometric lens!
point it at the sun
There’s even hypercentric lenses which have reverse perspective. Objects further away appear larger.
They can see around objects.
But they’re even larger than telecentric lenses
Yeah hypercentric lenses are wild!
Good lenses. Bad camera.
Arri signature primes and zooms (high end cinema glass) incorporate a telecentric design.
Something about this seems wrong
aka orthographic projection in computer graphics
(Did i make this comment before?)
Yeah it's orthographic projection in real life!