Hypercentric optics: A camera lens that can see behind objects

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Telecentric and hypercentric optics are very different from our eyes or normal camera lenses. They have "negative" perspective or no perspective, respectively, leading to very unusual images. In this video I show how to use a common fresnel lens in the creation of your own telecentric optical system.
Fresnel lens, 300mm dia. 200mm FL is sold out... www.amazon.com/gp/product/B07...
$5 projection lens on eBay: www.ebay.com/itm/Delta-108-Pr...
Good practical discussion of telecentric optics: www.lockhaven.edu/~dsimanek/s...
www.mii.cz/art?id=626&lang=40...
Idea to use macro tubes for telecentric conversion of normal lenses came from here: www.4photos.de/camera-diy/Tele...
In-depth info on telecentric lenses: schneiderkreuznach.com/applic...
Commercial hypercentric and telecentric lens maker: lw4u.com/
Paper on making telecentric lenses with fresnel front elements: sci-hub.tw/10.1117/12.455256
/ appliedscience

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31 июл 2024

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Комментарии : 929

@trollenz 4 года назад

Scanning electron microscope : check XRay imaging system : check Waterjet cutting gear : check Ruler for drawing straight lines : over budget

@GRBtutorials 4 года назад

Don't forget the DeLorean, the cryocooler, the turbomolecular pump, the mass spectrometer and the $20000 Tektronix 5 Series oscilloscope! And surely I'm also forgetting something...

@aaalbert 4 года назад

Sputtering setup

@sebastianschmidt566 4 года назад

The ruler is currently attached to an obscure experiment 😂

@blackopps01 4 года назад

this paper have square lines, he dont even try :D

@verdatum 4 года назад

And the ruby laser. He has a tektronix scope? I've used them with my job but the one we have cost as much as the house I grew up in.

@matthewhall6288 4 года назад

The "zooooom" sound created by sliding the armature adds to the effect.

@Khrrck 4 года назад

It's more of a shooooooooooof really.

@dustinhaile4196 4 года назад

its more of a shwoooooooooooooohf really

@gearhead1302 4 года назад

I thought he was putting that effect in at first 😄. Not his style to add silly effects I thought to myself.

@guillermocastillo8488 4 года назад

YES!

@PapoochCZ 4 года назад

Funnily enough, the term 'zoom' comes from the sound that the first variable magnification system made when zooming.

@TechyBen 4 года назад

"Lens sees around objects... by being so big, it is around the object." ;)

@SynomDroni 4 года назад

You know how much I don't like clickbait, but I gotta clickbait...

@MLGJuggernautgaming 4 года назад

Yeah only works for objects smaller than the lens itself I would think 🤔

@thepianoaddict 4 года назад

@@MLGJuggernautgaming only if you want to look around it from all sides, as long as part of the lens looks past an object even on just one side, it can look "around" it on that side.

@JNCressey 4 года назад

I can do the same thing much easier with a cardboard box and two mirrors.

@Qicksilver0075 4 года назад

Give me a big enough lens I can see around the world

@PracticalEngineeringChannel 4 года назад

This broke my brain. In drafting classes, you learn to think in parallel projections, but I had never considered that you could capture images that way. Lots of 3D CAD packages will allow you to switch between perspective and parallel views. It's necessary to produce accurate drawings, but it's really disorienting to navigate a 3D structure without distance cues.

@satibel 4 года назад

You haven't played enough isometric games :p

@nightrous3026 4 года назад

Literally the first thought that came to my mind

@verdatum 4 года назад

Seriously though, look into chrome-ball photography. It is even crazier.

@DrunkenUFOPilot 4 года назад

I'm always flipping between perspective and ortho views in Blender while 3D modeling. Like at the end of the video, you need parallel projection to compare details on near and far ends of something, and perspective for those vital spatial size and shape cues. BTW, drafting was my favorite class in high school! (Don't tell my physics teacher.)

@davidwilkie9551 3 года назад

Went from there to emitter-receiver inside-outside holographic projection-drawing. Still grinding the mental gears.

@Nevir202 4 года назад

Now I really want to see a scene in a horror movie, where in camera, using a MASSIVE one of these lenses, we get to see the killer is behind the person in shot, by adjusting the camera like this. Can you imagine how freaky it would be, at they seem to appear and then grow to loom over them, out of nowhere? 😱

@brenebon6980 4 года назад

That sounds like an awesome piece of cinematography right there!

@justalex3209 4 года назад

@@brenebon6980 AWESOME IDEA

@DangerousMuteLunatic 4 года назад

Nevir202 I was actually just thinking a lens like that could be used for a really great sci-fi "mind-bending" effect, where things get all warped and weird. Like a teleportation thing.

@Nevir202 4 года назад

Patchwork Productions Damn, that could be awesome too. Use it such that something which appears to be a background, shrinks down behind the subject, and then when it expands back out, it’s different?

@geyotepilkington2892 4 года назад

This is absolute genius. Or use it to portray a mental illness or great confusion or something. SO MANY GREAT POSSIBILITIES

@RobertMilesAI 4 года назад

The 'dolly zoom' type effect you can get with this is really interesting. I wonder if anyone has actually used a lens like this in film-making

@DonnieX6 4 года назад

yay, good seeing you here! :D

@Cyber_Kriss 4 года назад

@@DonnieX6 It's not the DJ... 😂

@zuda8919 4 года назад

I was honestly wondering how I could use it in a music video

@Alex-lc1bv 2 года назад

This thing already works very similarly to how they normaly do a dolly zoom. If you wanted to scale it up, you would need a massive lense.

@alexanderklee6357 2 года назад

@@Alex-lc1bv didn't he say that it won't look good beyond 1 meter?

@JimCoder 4 года назад

In a darkened room I pointed a 10" telescope toward closed venetian blinds on a bright sunlit day. I was able to focus an image of the stairway *outside* the closed blinds. The tiny amount of light leaking through the blinds' cord slots was enough to form the perfect image. X-Ray vision! Weird.

@hrgwea 2 года назад

This is how they combine the light in a telescope array to produce a single sharper image. They don't need to capture all the light in a giant circle, just specific spots.

@pchris 2 года назад

If I'm not mistaken that's called a pinhole camera. My curtains in my bedroom as a child did this and would project what was happening on the front lawn onto my ceiling so I could see when the mail man was arriving.

@runforitman 2 года назад

oo I might have to get out my telescope and give this a go I wonder if bird watchers could use it to see through camouflage

@pectenmaximus231 2 года назад

@@pchris “Camera Obscura”

@thegirlwiththemouseyhair6486 2 года назад

@@pectenmaximus231 the game?

@jamesgrimwood1285 4 года назад

In a parallel universe this is a video explaining these weird effects known as "perspective" and "depth of field" to creatures with hypercentric eyes.

@mrmeatman9948 4 года назад

How dare you put the image of humans with 10" eyes in my head.

@1224chrisng 3 года назад

@@mrmeatman9948 don't Giant Squids have eyes that big?

@urphakeandgey6308 2 года назад

@mr meat man anime

@TrickyNekro 4 года назад

I find this lens much more agreeable than many things in life with its "negative perspective".

@Gr33kChief 4 года назад

Lol

@josebregel6752 4 года назад

Lol

@rgstever 4 года назад

I use to use a similar lens for creating orthographic snapshots of objects for CAD use.

@mattmoreira210 4 года назад

That's awesome! This was the first thing that came to my mind when he demonstrated this effect.

@user-cz9ss4yq4x 4 года назад

Actual 5Head 🍷 Holy shit

@coolerdaniel9899 4 года назад

That's actually so cool!

@4.0.4 4 года назад

@@AppleGameification yes, but the lens is as big as your frame. I mean, maybe there's some moving-lens thing for cars and other large objects? I assume it would be possible.

@victortitov1740 4 года назад

Me too, actually without even knowing it was called "telecentric"! Just a big magnifier glass with camera/eye attached right at the focal point.

@geoffrjjjjjjj 4 года назад

The click bait is "Applied Science". I don't even read the title when I see that name.

@bemusedindian8571 4 года назад

“You know how much I hate clickbait” - And that is one of the reasons that I love your channel.

@Tre3141 4 года назад

Yeah, I find myself hardly ever watching channels that upload multiple times a week. Quality over quantity.

@RealLuckless 4 года назад

Well that's a neat looking project. I get some weird enough looks when I cart out a small large format camera in public, so I'm on the fence for whether or not I want to play with something like that... But this does remind me of what was always my favourite demonstration of neat properties of optics: Using a wide open lens to 'focus through' something like a wire mesh screen or chain link fence.

@the_eminent_Joshua_E_Hrouda 4 года назад

I bring my camera up to the chain link fence and shoot through the rhombus shaped hole ;)

@Jambeeno 4 года назад

Yeah that's a neat trick. Steve Mould demonstrated it when he was figuring out how to film inside a microwave: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8bXhsUs-ohw.html

@MushookieMan 4 года назад

I had heard of telecentric lenses, and knew a little about geometric optics, but you put it all together. I always learn a ton from your videos.

@jomiar309 4 года назад

Honestly never seen anything like this before. I love how you introduce me to, and then explain, all kinds of new and interesting things! Once I get my maker shop set up, I may play with this one. It's easy, straightforward, and would be fascinating!

@Hyraethian 4 года назад

knowing the limitations to a system and the failures that came with a project help a lot in learning. Quality content time and time again.

@br6768 4 года назад

This channel always blows my friggin mind!

@ryPish 4 года назад

Really cool, as always! I'm glad this effect is rather easy to reproduce, no electronic microscope or other crazy gear needed :p

@StardustBruno 4 года назад

Thank you for showing the subject of the video right away, instead of making us wait (or skip) to see what we clicked for.

@pmyou2 4 года назад

I am amazed this is the first time I am hearing about all this. It is such a fascinating concept it deserved to be widely known.

@projectartichoke 4 года назад

A good source for truly huge Fresnel lenses with low magnification is some older TV sets where they are used over the screen. Mainly old-style enclosed projection sets.

@satibel 4 года назад

Afaik lcd screens have some too, so a trashed large screen tv should work fine.

@fascistpedant758 4 года назад

Fascinating, I had never heard of anything like this. Thanks.

@marcmarc172 4 года назад

Extraordinary content! Can never expect the topic of the next video but it is always fascinating!

@seattlefiorelli 4 года назад

I was a little stressed out that maybe something was wrong. So glad youre still here doing these!

@skipfred 4 года назад

That bittersweet feeling of a seeing a new Applied Science video but knowing that there probably won't be any more for the next month

@fzigunov 4 года назад

You forgot about the Corona lockdown... There might be!!

@xaytana 4 года назад

I really want to see someone mix tele- and hypercentric optics into one of those VR games/demos that make use of hyperbolic space. The combination of the two seems like it could produce a very interesting result.

@daveloomis 2 года назад

Hyperbolica now has a release trailer. 😄

@BillyEilish 2 года назад

I remember having an idea similar to this back in high school.. I thought on how mirrors could reflect things we could not directly see with our eyes and quickly learned the advantage of angles. The fact that the lens is so large is helping get those light rays into the camera's sensor. I've never thought of making a lens out of the idea. I truly enjoy the video and the explanation on how it works and how it can be built. Great stuff!!

@vanarppayhsak1330 4 года назад

Hey I want you to know we absolutely love your work and also understand your channel is highly underappreciated for what it is worth. Hope you keep making these informative videos out here. Thank you for being awesome. Love.

@AtlasReburdened 4 года назад

Aperture Science. We do what we must, because, we can.

@cmdraftbrn 4 года назад

the cake is a lie

@rahulsawant_pikachu 4 года назад

Okay. The test is over now. You win. Go back to the recovery annex. For your cake

@randydireen3566 4 года назад

For the good of everyone, except for those who are dead.

@Dudleymiddleton 4 года назад

Cave Johnson!

@BRUXXUS 4 года назад

For there's no use crying over every mistake, We just keep on trying 'till we run out of cake.

@FMAxBrotherhoodXx 4 года назад

The first law of physics: There are no free lunches

@potatojz38 4 года назад

Very interesting, I liked how at the very end you included what real world examples it would have. Very interesting

@madichelp0 4 года назад

One of the few channels that can have a clickbaity title yet still undersell the contents of the video.

@justicesportsman6020 4 года назад

Didn't even notice the clickbait title. I never need to read the title of your videos to click on them XD

@johnalexander2349 4 года назад

If you've heard of lenses that can see behind themselves (Nikon 6mm), it's not hard to guess what this would be about.

@LightningHelix101 4 года назад

Is it really clickbait tho?

@dans6127 4 года назад

yeah, I'm sold at the Applied Science part

@alanclarke4646 4 года назад

@@KahruSuomiPerkele yeah, but "video with slightly misleading title" is so much more of a mouthful. Lol.

@HuygensOptics 4 года назад

You could actually look behind the moon if you had a Fresnel lens with a diameter approx the size of the Earth...

@ezekielmartin4323 4 года назад

We'll call that a stretch goal.

@EgnachHelton 4 года назад

Could gravity lensing caused by massive stars be used in this way?

@nonplayercharacter9653 4 года назад

Thank you so much for making these videos. I hope you continue to do it. It is really inspirational to those of us who think critically and outside the box.

@TheRumpusView 4 года назад

That was utterly brilliant, particularly all the fabrication and practical details at the end. Thanks.

@milky3ay566 4 года назад

Good, now I can use this lens at the poker table.

@0dWHOHWb0 4 года назад

So it's like orthographic projection in real life, sort of?

@forasago 3 года назад

Orthographic projection = telecentric optics capture light in parallel so you can only see things the size of the lens and smaller. Hypercentric optics like in this video require even bigger lenses for the same object, in order to capture light that comes from behind it.

@android61242 4 года назад

This was a very cool video. Again something I didn't know I was interested in until you brought it up!

@iCQ_www.SPCL.tk_ 2 года назад

This guy is a gem, seriously he has some genius videos and projects!!! 💖💕 Thank u sir 🙏

@GodBlessHipHop 4 года назад

I find it odd it has the same effect of moving your head to one side to see whats behind the object, i mean, just look behind it..

@skuzlebut82 4 года назад

Thank God! An interesting RU-vid video!

@ToTheGAMES 4 года назад

Albeit a short one. I'll take it anyway.

@TheTwistedTraceur 2 года назад

thank you for showing it quick to prevent the clickbaityness. youre a good person

@cleebe823 2 года назад

Implications of snells law, a huge lens, and small objects. Nice video. Very intuitive demonstrations.

@bitluni 4 года назад

light field camera next?

@verdatum 4 года назад

This reminds me of chrome-ball photography, where it technically sees 360 degrees, so long as you process it and have enough resolution.

@thiesenf 4 года назад

really good and big fish-eye lenses do take in a view of 180 degrees...

@toolthoughts 4 года назад

excellent work once again, I love the detailed and straightforward explanations

@brucewilliams6292 4 года назад

Cool stuf! I appreciate the variety of things you work on. Your explanations are great.

@xenontesla122 4 года назад

Really interesting! A while ago I made some reverse perspective images with a parabolic mirror, but the images had a bit of distortion and the mirror got scratched. I wonder if it's possible to make better images with an accurately positioned mirror.

@realdamageboy 4 года назад

that is good idea! how about fresnel lens not straight but with curve, like attach it to horizontal material with hole, pour in hot water to make sift plastic for fresnel lens and then let it cool and it must stay in shape

@AtomicShrimp 4 года назад

OK, one last time. These cows are small… but the ones out there are far away. Small… far away…

@azz2 4 года назад

My first thought. Guess it turns out Dougal was right after all...

@wyatt639 3 года назад

Burger

@jorgenleangen 4 года назад

This is so fantastic!! Thank you for bending our mind - every time you create a video!! :)

@thetruthexperiment 4 года назад

You always make videos about things I’ve always wondered about but couldn’t figure out how to ask. Like, why is their perspective and why can’t we image things without it? And blam. You answered all these questions. Thank you.

@AngryArmadillo 4 года назад

The “nothing lens” has focal point at infinity :)

@AtlasReburdened 4 года назад

Idk, are we actually Euclidian?

@realdamageboy 4 года назад

just glass has focal point at infinity. I am searching now for lens with imaginary focal point (i)

@gudenau 4 года назад

I wonder if you could use a couple cameras to make some sort of crazy 3D scanner.

@RFC3514 4 года назад

You could, but it would be crap compared to just using a single camera that moves around the object (or rotating the object itself while the camera stands still).

@satibel 4 года назад

@@RFC3514 using more cameras is better if you have the budget, since you can locate each camera precisely, and extract coordinates more easily. Another great thing is that you can scan objects in movement with such a setup. But only a pair will make for a somewhat poor scanner, if you only take a single shot, though it would divide by 2 the number of shots required.

@RFC3514 4 года назад

@manaquri - You don't need to "locate the camera", the photogrammetry software does that for you. It's far more important to have lenses with as little deformation as possible (or at least a _known_ deformation, that can be compensated in software). Scanning moving objects with CMOS cameras (i.e., 90% of the cameras used nowadays) is just masochism (and not just because of rolling shutter artefacts; there are other issues, especially if you need to combine data from multiple cameras). If you have a decent budget, use LIDAR-style scanners. If you're using visible spectrum consumer / "prosumer" cameras, then the image geometry (lens deformation and resolution), the lighting, and the number of images, are the most important factors in getting an accurate photogrammetric model.

@cap_n_munch3139 2 года назад

I love your videos!! Long time watcher. Please make more greatness!

@illustriouspics1 4 года назад

Wow the way you elegantly explained how an aperture functions. Wish I saw this video years ago

@noahtaylor7632 4 года назад

“Negative perspective” reminds me of a lens my friend had that had a minimum f-stop of less than 1. I always wondered how that was possible.

@LazerLord10 4 года назад

I think that the f-stop of less than 1 isn't related to telecentricity, as Leica makes an f0.95 50mm lens that has normal perspective.

@Toad_Hugger 4 года назад

The maximum focal ratio is determined by the distance of the lens to the sensor/film divided by the diameter of the lens. This is effectively the flange distance divided by the throat of the mount. A camera with a flange distance of 50mm and a throat of 25mm will permit a maximum focal ratio of f2, while a camera with a flange of 25mm and a throat of 50mm will permit a focal ratio of f0.5. It isn't uncommon for lenses to protrude inwards and past the throat of the mount. This is less common on SLR cameras due to the mirror requiring clearance to move, and more common on mirrorless/rangefinder cameras because of the lack of a mirror. You typically don't see lenses with such high focal ratios because of the increased amount of correctional elements required to produce a quality image.

@NAG3V 4 года назад

@edo The theoretical maximum if we want to have well corrected lens and have the usual f# to light gathering relation is NA = 1, f/0.5 lens without going into immersive setups.

@uponthefaceoftheabyss4254 4 года назад

Father Ted reference!

@rationalmartian 4 года назад

Sans any cute Moo Cows. LOL.

@gavinbruce6656 4 года назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-MMiKyfd6hA0.html

@phyjob 4 года назад

I didn't know about hypercentric, but this is the clearer explanation of telecentric lenses that I know of.

@skwaab 2 года назад

Such a beautiful effect

@electronicsNmore 4 года назад

Loved the video! Sadly, a very large percentage of videos on YT that get the most views, are the type of videos that dumb people down, or don't help/educate others. You deserve way more views, like many other YT channels, including myself.

@WoodenWeaponry 4 года назад

That was a very nice comment, right up to the last few words

@thegirlwiththemouseyhair6486 2 года назад

I almost agreed til you stroked your ego at the end, guy. Get over yourself.

@vjm3 4 года назад

Before watching the video: Me: "Sweet. Now I'll be able to spot invaders hiding behind my back yard fence." After watching the video: Me: "Sweet. Now I'll be able to spot invaders hiding behind a very thin pole that's less than a foot away from me."

@dakel20 4 года назад

Useful for watching out for Creed.

@AtlasReburdened 4 года назад

@@dakel20 That guy from the office with the mung bean sprouts?

@extrastuff9463 4 года назад

Just build a tower in your backyard with... uhm a lens that has a larger diameter than your backyard (not sure how to work this out practically) and then you could! I guess you'd have a better chance to let people living around you install pan tilt zoom cameras on their terrain, and even that's a long shot.

@alanclarke4646 4 года назад

Sorted. I don't have any very thin poles in my yard.

@Greg_ThymeTraveler 2 года назад

The sound the camera slider makes is a cool sound effect to accompany the change in focus.

@hi6go7 4 года назад

I always appreciate your videos. Thanks for the hard work!

@legendarysideburns2213 4 года назад

How big smartphone cameras will be in 5 years

@richardhead8264 4 года назад

*_Samsung_*_ wants to know your location._

@Cole-ek7fh 4 года назад

imagine thinking we won't be eating the dead in 5 years.

@thiesenf 4 года назад

You don't attach a telephoto lense to a camera... you attach the camera to the telephoto lens...

@user-qx7tm5df8j 4 года назад

@@Cole-ek7fh we do already. Tons of dead animals everyday

@renakunisaki 4 года назад

Nah they'll just have 200 small lenses

@Chickennuggetjoes 4 года назад

Do not watch this video drunk, your carpet will thank you

@Pants4096 4 года назад

Gah! Brilliantly simple description with those hand drawn diagrams of how an aperture selects certain light rays. Well done!

@gibbyrockerhunter 2 года назад

Dude this is so fun. I love your videos.

@KyleClements 4 года назад

Was anybody else distracted by the fact that the word "fresnel" was actually pronounced correctly in this video?

@simontay4851 4 года назад

It wasn't though. He didn't say the S.

@ToTheGAMES 4 года назад

In my environment it's always pronounced correctly, I don't know any other way. So no, I'm more distracted by your comment. ;)

@Davvg 4 года назад

Simon Tay it’s French, the ‘s’ is not pronounced

@simontay4851 4 года назад

@@Davvg oh, ok. I didn't know it was a french word. Must've been invented by a french person named fresnel.

@BoffinGrusky 4 года назад

Can it see behind my girlfriend's motives?

@BoffinGrusky 4 года назад

Seems as if there are a lot of guys that have the same concerns that I do.

@ShainAndrews 4 года назад

@@BoffinGrusky Perhaps it is all the same woman?

@Cole-ek7fh 4 года назад

easiest way to see behind her motives... ignore her.

@Baigle1 4 года назад

This thread says a lot. Sad they are all so stereotypical that they've evolved the ability to universally deceive and manipulate us. Its almost like 63% of women lean hard left in politics... oh wait, they do.

@danieleliahushapiro4280 4 года назад

@@Baigle1 still. Ignore them. They'll come around. If all do at the same time they'll come around faster instead of chasing the white knight

@subliminalvibes 4 года назад

Great video!! Thanks Ben. I believe this is very similar to how 3d light-field photography works too. Brilliant stuff. Very cool.

@vidasvv 4 года назад

Another GREAT video, TNX 4 upload !!!

@kolobcreek 4 года назад

Ok I'm tired with awesome shit! Make a micro thorium molten salt reactor! Yes in your garage! You're that smart!

@TheZenbudda 4 года назад

LOL the lens is larger than the object its observing, of course it can see around it

@Llllillilililililillll 4 года назад

TheZenbudda right? "You know how much I hate clickbait" proceeds to clickbait..

@Fermion. 4 года назад

How is this clickbait? What were you guys expecting? The only other way to see what's behind a solid object is to bend space-time. Not even all of the combined power of every power plant on Earth can come close to performing that feat.

@jperez7893 3 года назад

wow you are such a great engineer and communicator

@etmax1 4 года назад

As always, Brilliant

@karthick86c 3 года назад

2:49 What a beautiful explanation for aperture! Thanks man. Never thought of a lens aperture this way!

@josephmagniez9580 4 года назад

A very interesting and surprising topic as usual. Thank you :)

@tamasmihaly1 4 года назад

Amazing as always.

@SebastiaanSwinkels 4 года назад

Reminds me of Vision Mantis 3D microscopes. Basically moving your head side to side or up / down will allow you to see around the object you're looking at. Very neat, very useful when working with tiny components on PCBs

@leogray1091 4 года назад

I know theocentric and hypocentric from working for production line. But I never thought the theory is actually this simple with the aperture. Thank you for showing this

@lfjvs 2 года назад

This is really interesting. Very good explaination. Thanks

@VinceTibo 4 года назад

Thank you for existing Ben

@sjoythehawk 2 года назад

Very inspirational. And you had explained the physics and engineering in detail. Thanks so much ;-)

@Knoxvillemoto 2 года назад

Very cool. It's funny that you mention metrology since alot of optical metrology systems I've been looking at recently use telecentrics optics. The manufacturers make it out as if though it's some crazy new technology when in fact we've know all this for many many years.

@Uncle-Duncan-Shack 4 года назад

Very nice demonstration. We have indeed used telecentric lenses with machine vision for inspecting wedge wire filters screens.

@programagor 4 года назад

HOW DID I NOT SEE THIS VIDEO WHEN IT CAME OUT? I was actually looking into this exact same thing, making a lot of drawings and simulations on how to construct such objectives. Now this

@ati77711123 4 года назад

As always, Im impressed.

@johnvanderburgh4502 4 года назад

very cool thanx for sharing lots of potential for new applications

@SeanBZA 4 года назад

Finally got a use for those old overhead projector condenser lenses then. Seen this with having them up close, but till now never knew what it was, and the applications.

@frost8077 2 года назад

I'm just glad you correctly described aperture. So many people believe it squishes and stretches the light.

@NAG3V 4 года назад

Thanks for cool demonstration and very clear great explanation!

@fluffycritter 4 года назад

Okay this is really cool and I'd love to see filmmakers take advantage of this effect. I could totally see it working as a disorientation effect.

@mckenziekeith7434 4 года назад

There is NO other channel where I would watch a video with this title.

@syber-space 4 года назад

Oh... this would make a great demonstration for teaching orthographic perspective in a drafting class... I'll have to make a note of this. Thanks for the ideas!

@MLGJuggernautgaming 4 года назад

I find optics really interesting because it seems daunting at first, but concepts are pretty easy to comprehend. Just from the thin lens equation you can calculate a lot.