Making Tiny Fresnel Lenses during a Pandemic

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This video shows several types of micro-lenses that I made using a DIY maskless wafer stepper. The tiny lenses can for example be used for building a Shack-Hartmann wavefront detector.
Explanation of the Shack-Hartmann principle can be found on Wikipedia:
en.wikipedia.o...
This is the download link for Windows installer for the Zone Plate app:
www.huygensopti...
RU-vid does not like to redirect to this link. the file is (last part of the URL): /assets/zp_writer.zip
For Windows 10 and for personal use only. Virus scanners and Windows will nag about it being a rare / unknown file and make installation sometimes difficult. Sorry about that. Install this app at your own risk.
Link to the maskless wafer stepper playlist:
• DIY Maskless Wafer Ste...
Applied science video on photolithography:
• Antique 4x5 camera cre...
Reference for article on zone plate design:
laser.physics....
Wikipedia also explains this very clearly, but I just found this article first.
Links to some commercially available Shack-Hartmann detectors:
www.thorlabs.c...
www.optocraft....
@ 0.34m: four happy seconds with Deodato, listen to the full song at:
• Deodato - Happy hour (...

Опубликовано:

30 сен 2024

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Комментарии : 187

@9069able 4 года назад

Also I really like what you're doing,though I also hate you because you've added a couple of projects to my list of stuff I want to do.....

@Hailfire08 2 года назад

I have the same relationship with Sebastian Lague

@scissorhandson Год назад

I wonder if we could communicate on a project idea I have? Would you please contact me?! Or, how could we PM?

@yamahantx7005 2 года назад

As someone who builds custom research microscopes, I must admit that your knowledge of optics is stunning. I wish we had touched on some of these topics in undergrad, or even grad school.

@Brandon-rc9vp 3 года назад

Every once in a while I re-watch one of your videos just to feel good about the world, thank you for the great content!

@ExplosiveAnyThing 4 года назад

I love this channel one of the few best channels on youtube! keep it up!

@mrcpu9999 Год назад

RU-vid must've turned on the AI to max. I just sat down to watch some history documentaries, and realized I didn't have any tiny fresnel lenses, and I meant to pick some up, and *boom*, youtube brings up this video. Gotta love 'em.

@paulklem9249 2 года назад

Very cool. For 2.5 years in between high school and college I worked at a division of the Alliance Tool Company in Rochester Ny called Fresnel Optics. It was a at the time a tour de force of precision tool (mold) making, plating and clever use of platen presses and acrylic to make all sorts of fresnel lenses at the time. The largest customers being makers of overhead projection projectors. We also make laminate lenses for steel production, fighter jets, pin setters, etc. Like the Record Making industry, a brass master was made of which a ‘mother" was pulled by nickel plating . That was then used to consistently make molds for production. The master molds were cut with shaped diamonds on a spinning brass disc set on air bearings in a controlled environment room. The shavings which were puffed off every minute or so looked bike brass cotton balls. The machines where made there using tool maker’s from Germany. I loved it but wanted to study art.

@lithostheory 3 года назад

4:00 we also use wavefront sensoring in astronomy to correct aberration from the atmosphere and reach diffraction limited imaging on 10+ meter telescopes.

@Nosirrbro 4 года назад

The shack Hartmann detector seems very interesting, I never would have thought you could use fresnel lensing alone to observe something as seemingly invisible as light waveforms.

@tomditto3972 3 года назад

Zone plate arrays. One won't do it.

@ubereatsegodeath2281 3 года назад

oh yoo I played journey with you hahaha. Can't believe I'm seeing you in a random comment section.

@Nosirrbro 3 года назад

@@ubereatsegodeath2281 Wow that's funny, what was your username?

@ubereatsegodeath2281 3 года назад

@@Nosirrbro Gamer Bitch, I think I have you added on steam

@Nosirrbro 3 года назад

@@ubereatsegodeath2281 Yeah, I think we only were together in the very beginning of the game, but that's still pretty funny, especially on a seemingly pretty niche channel such as this

@benrasmussen9878 3 года назад

Thank you very much , I have always been fascinated by these lenses. You made a lot of sense , to me. Can the formula work backwards? If you have a preset of frequency, can you generate a pattern?

@josephcoon5809 Год назад

What if you wanted maximum chromatic dispersion say, for a solar collection array that separates and focuses each wavelength to be sent to specific semiconductor PV cells based on their band gaps? This would be to allow for more efficient conversion of solar energy to electrical energy while minimizing thermal degradation due to band gap mismatches between light and semiconductor.

@horus2779 28 дней назад

Time Dilation, Light passing through different mediums slows it down

@Vikingman2024 3 года назад

Wow, nice shop! Another very interesting video. It takes me a while to digest the information you have in these videos, even with an engineering background. The math part I really enjoy, it is part of the fun in designing and inventing new things or playing around with past inventions and discoveries. Thank you very much!

@en2oh 2 года назад

I suspect this is a common observation by many, but I wish the internet was available when I was in Grad School. Thanks for sharing your knowledge (and enthusiasm) with us!

@traitzco.7438 3 года назад

I would love to see a livestream: ~Chilling at your compound, jamming to loud music, experimenting with light, cameras, optics, interference, feedback. I find your interests -> interesting

@modelllichtsysteme 3 года назад

Nice video!

@trashdigger2119 4 года назад

that software is pretty awsome! although indeed I had quite some trouble to get it past the virus scanner. maybe make a digitally signed version next time? btw whats the central intensity correction for?

@HuygensOptics 4 года назад

I'm not sure how to digitally sign an application. Sorry I did not discuss all the features of the program. The central intensity correction can be used if your exposure system for some reason has a higher intensity in the center than at at the edges. So the two numbers you can fill in are the radius of the curve in the correction and the magnitude, which should be a value between 0 and 255. You can only find the correction in the exported images, not on screen, since this image can consist of many exposure images.

@david203 2 года назад

You can usually pack an EXE application into a ZIP file for getting past security checkers. That's the easy solution.

@ramjetross 3 года назад

Very nicely done. Another application that these could be used for is to collimate or focus light from multiple light sources. For example, high power Chanzon LED COBs have a 10x10 array of LEDs on it's board. I think it's almost impossible to focus all of them to a single point without putting micro lens in front of each LED. I think in theory you could collimate or focus each LED if you knew the distance and layout of the LED array. I think you can even take it a step further and have all of them focus to the same spot by offsetting the centering of the outer LEDs in the array since if they were perfectly centered above each LED, you'd just get an array of focused points. At the scale I'm thinking about, the lithography should be rather easy with large feature sizes. I can't find anyone who makes such arrays of micro lenses for focusing multiple light sources to a single point.

@Yutaro-Yoshii 3 года назад

Just made an online version of the diffraction grating software. Thank you for your inspiring video! (I can't seem to post the link here since it seems that youtube silently deletes my comment as soon as I edit in the link. You can find it on my github with the following info) github username: martian17 repository name: diffraction-grating-generator

@dougaltolan3017 2 года назад

A thought.. The device presented at 3:44 Instead of the dots and measuring the offsets later, how about using one of the lenses presented at 6:00 scan it across the subject during a long exposure, rotate it 90 degrees and repeat. The output would be an image where brightness corresponds to the subject geometry.

@plugplagiate1564 3 года назад

you could improve the picture quality by using a proper stand, or a box with a computer screen inside. and then take the picture, after calculating the refresh rate of the monitor. or use a transparent foil and copy the image by contact. this would give more sharpness, saying better results.

@erikschiegg68 3 года назад

De man kan de Hubble repareren. Met garantie!

@arsaeterna4285 3 года назад

what a beautiful video technology, family, life goals!

@fluffy_tail4365 4 года назад

Oh, I played with the Fresnel pattern when I was working with programmable LCDs to do holographic 2-photon microscopy, I guess I could have gotten better results if I used the pattern you've shown in this video instead of the Fresnel one, since they are diffractive devices and not refractive. At least if I understand correctly.

@TheArtofCodeIsCool 3 года назад

Great stuff! Now I'm wondering about how to exploit this tech to create holograms. Zou dat kunnen?

@frogz 3 года назад

if you figure out how, let me know!! i've wanted to make my own holograms for a while

@supersasquatch 3 года назад

Dude what the fuck! Subbed

@hc3d 2 года назад

"I've worked a lot in the same room with my wife. This was ... a lot".

@YT-Observer 3 года назад

I like how the YT system thinks the viedo is about covid and controversial

@joshhennen 3 года назад

i also found that interesting

@hullinstruments 2 года назад

“Little man cave“… Oh you mean the place you keep enough cool stuff, Experience, and knowledge..... you could pretty much redefine optical science as we know it… I mean… If you were stranded there, played less air guitar, and put your mind to it? 😂 I really love your channel and its helped me so much while setting up my own optics/laser lab … Over the past few years…in the corner of my electronics lab. Your channel is an awesome wealth of information! It’s just a hobby for me and I have no Real education in optics… I am a machinist by trade, and accidentally started a business/electronics lab. I do mostly metrology work, test equipment tinkering, and component level board repair. I don’t do consumer electronics or anything like that, most of my customers are in industry… Manufacturers, even a few really cool labs and stuff.… And I thought I was A fast learner… Then I discovered optics… And I’m humbled every day! I always love your content! It’s in my playlists that are constantly streaming in my lab to keep me company on these long days

@HuygensOptics 2 года назад

Yes, optics is great. I also don't have a background in optics (I'm a chemist by education), and most of my knowledge is acquired from watching other specialist and of course a lot of trial and error. Keep up what you are doing!

@IdowuAsumah 5 месяцев назад

(Kindly pardon my profound ignorance) Hi, thanks for the video. I have a quick question: is it possible to make a 50mm x 50mm fresnel lens for medium format cameras using laser etching machine and a piece of clear acrylic?

@tazman1937 3 года назад

Have you considered making zone plates for focusing X-rays from PVD gold? You’ll need to upgrade your vacuum PVD system from thermal to e-beam, but I imagine you’re up the to task. They’re quite popular now in the micro-Xray-Computed tomography instrumentation, and I’d imagine you could sell some well-designed ones for good money to many universities or corporate research labs. The principle is the same for X-rays as it visible light, but especially advantageous due to the fact that the the refractive index of most materials is ~1 in the X-ray regime.

@Masoudmpo 4 года назад

Your videos are pure gold.

@sphericalchicken6639 4 года назад

What photoresist are you using and where do you get it from. Excellent and very interesting content.

@HuygensOptics 4 года назад

It's Olin 00835 by Ciba Geigy. I got a sample of a colleague a few years ago. But I don't think the exact type is important as long as it yields layers of around 1 or 2 um and preferably has a high refractive index.

@sphericalchicken6639 4 года назад

@@HuygensOptics thankyou I will have a look into it.

@EdoDijkgraaf 7 месяцев назад

This is so great. Thank you for the inspiration (and for making me laugh so lout my daughter came down to chenille on me). I will try to measure my Minolta 500mm f8. Cheers!

@ExtantFrodo2 3 года назад

I wonder if anyone uses (or if one could use) Shack-Hartmann wavefront detectors as input to an adaptive optics telescope system.

@ShaunVillafana 2 года назад

Ahaaa -zee microfilm. You did good Bond. You might zay ... maybe even too good vor your own good. *Click*🔫 Now, QUICKLY, hand ovah zee microfilm. Don't play coy with me Bond, it is no use!

@danieldc8841 3 года назад

Shack hartmann sensors are used to detect the aberration of starlight caused by the atmosphere and correcting for it using deformable mirrors in telescopes

@timothyahkoy8202 2 года назад

My dumbass intentivly listening having no understaning of whats being: Huygens Optics: "Diffractive lenses have a large chromatic abberation Me: I concur , here here :'D

@martinmckee5333 2 года назад

A decade ago - during my fine art degree - I did a project constructing zone plates with strictly photographic methods. Of course, they were rather larger than these - most around 5mm across. It's tempting to return to that project with some better technology. Edit: corrected size of lenses I made.

@larrythompson9100 2 месяца назад

Sounds like some kind of transmission underneath the audio track near the end of this video, almost like the sound of two black holes colliding and collapsing in and upon one and each other

@NWRefund 3 года назад

Is the source code for your application available?

@omsingharjit 3 года назад

Why small why not big ?

@AWeishaupt2 Год назад

What photoresist did you use? I assume it’s something transparent and permanent such as SU-8. How thick is the photoresist?

@hygiverse Год назад

I watched the video because I am interested in designing biodomes that reproduce tropical jungles. I am interested in the properties of the material and the qualities of it’s interaction with light. The purpose is to keep people from experiencing uncomfortable temperatures, and increase food production among other things. what are your thoughts on this? who do you think I should hire one day to conduct such research? thanks

@markayala7752 4 года назад

best channel in youtube

@airman2468 3 года назад

I was wondering: Do you think you could use a tessellated array of lenses with some nonlinear border shape to remove screen door effect on a digital display? It would be huge for VR applications. Anyway, I love the content on your channel. Very inspiring!

@HuygensOptics 3 года назад

Interesting. I think the screen door effect is caused by the black space between the pixels. I think it might be possible to reduce this by using lenses that are directly adjacent. However this would only work well for a very specific directions.

@airman2468 3 года назад

@@HuygensOptics I think I see what you mean. I'm guessing the best we could do then is reduced screen door in the foveal region, but areas in the periphery would experience some kind of periodic appearance of the blank spaces (like a 2D moiré interference). Which might add more headache than it removes. Interesting, though. Thanks for the reply!

@GezginDeneyci 2 месяца назад

verifocal lens de yapar mısınız

@valentinbeholder Год назад

Do you think is possible to make folding fernel lenses? It is kind of challenge :D

@ALL_ONE_SUN 3 года назад

Make some very affordable micro-lens arrays for light field displays so I can get some. Thanks in advance!

@Asdayasman 3 года назад

Where was the "please"?

@John.M.Gannon Год назад

Are there specific radius for each consentric circle, ???

@methylmike Год назад

what do you think your chances in the apocalypse are?

@mahmudexello 3 года назад

Hello , Your videos are awesome :) I saw a cheap old DLP on some site and I was looking ways to use it. Then I saw your video. Your channel is really top notch !!!! May I ask you the following : Is there a possibility to view these fresnel lenses you produced with an electron microscope ( after sputtering some conductor on it of course ) . I am really curious about the gray areas. How is the 3D structure over there. Is grey areas more porous or thinner than fully cured parts ? Thanks Greatly

@HuygensOptics 3 года назад

I myself don't have an electron microscope. But I agree, it would be interesting to see what the slopes of the miniature Fresnel lenses look like. They will not be porous though, just show a gradual thickness gradient.

@testboga5991 3 года назад

Are you the reincarnation of Anthony van Leeuwenhoek? 😉

@thecommentary21 2 года назад

Sounds like you are complaining...

@taiebehtahmasebi5807 2 года назад

Wonderful. thank you

@BariumCobaltNitrog3n 2 года назад

Laser printers can print on transparent sheets also. Maybe you could skip the analog camera step and using the darkness setting on the printer software could build up the density of the lens using the laser toner. I'm exploring the fresnel as a lens for projecting light for a hand-held searchlight. The structure and properties of this lens make it suitable for such an idea.

@yaroslavlitvinov2238 2 дня назад

Once I tried to do so and pattern fresnel lens (hologram of a dot) printed on a laser printer does not work (at least for me). I think more happens when beams come though a film it creates inclined concentric cavities inside a film memorizing amplitude and phase of wave front.

@jabajuba 2 года назад

Light field displays, here we come.

@GRBtutorials 4 года назад

7:23 Wait, so you don't have to etch the glass?

@HuygensOptics 4 года назад

That is correct. No HF, just photoresist.

@GRBtutorials 4 года назад

@@HuygensOptics Would it work better if it was etched? Also, I thought you'd need etching for the refractive lenses...

@HuygensOptics 4 года назад

Not necessarily. The refractive index of novolac-type photoresists is generally ~1.6, so even higher than glass. The only downsides are the sensitivity to scratches and it's absorption in the deep UV.

@victormultanen1981 Год назад

Thank you for this video, very needed.

@adwol 3 года назад

My new favorite channel

@lucianolizana446 3 года назад

Hello, that software is for making an spheric or aspheric fresnel lens?

@david203 2 года назад

The equations look spheric to me.

@Engineer_Stepanov 4 года назад

Good job!

@az113 3 года назад

As fact, it is inverted your task, you do MICRO lenses, but i need a MACRO lenses instead :)

@garrysekelli6776 3 года назад

Ah lifestyle changes. It's like that time when i changed from being a Bedouin shepherd in the desert to working as a well paid pimp working the house boat brothhels south of Utrecht.

@KP3droflxp 2 года назад

Please tell me you peeled the peel on the case at 0:22

@daltonedwards7670 2 года назад

The discreet jogging jointly harass because pilot electronmicroscopically share onto a abashed worm. safe, barbarous appeal

@david203 2 года назад

You missed the letter Z.

@bernhardneubuser8163 Год назад

could you indicate that you used for etching and also were you can get it in the Netherlands? Same for the photoresist. Thank!

@HuygensOptics Год назад

You can buy photoresists from microchemicals.com (Germany). They also sell developer solutions, but you can also use strongly diluted NaOH for this ( I think something like 0.01N.), which is much cheaper.

@maisonmallninja 3 года назад

jeez what a good channel

@placebomessiah 3 года назад

29A is hexadecimal for 666

@ak-xd1pt 2 года назад

Hi Do you know which company can make franell linze size 2 miter by 2 meter. Or 1.5 by 1.5 Material flavksible clear plastic.

@mitchwright1558 4 года назад

fascinating work and results you achieve in your shop. Did you consider using a LCD such as used in 3d resin printers instead of the projector DLP?

@HuygensOptics 4 года назад

No I didn't, because most contain color filters on de LCD, which will absorb a large portion of the 405nm light. The DLP also allows for 365nm to be used, which can increase the resolution even further.

@sznikers 2 года назад

@@HuygensOptics Elegoo has released resin 3D printer which has 8K resolution monochrome LCD. Would that be an upgrade? They also sell the screen alone as upgrade pack for their older 3D printer so you wouldn't have to pay for whole printer just to salvage the lcd.

@bashermans6012 2 года назад

Do you think it is possible to make a wavefront `filter` by placing small mirrors in the focal plane at the optical axis of the lenses in a lenslet array, reflecting only light back when the wavefront is flat? Or pinholes that only pass light when the wavefront is flat? Such a filter would be great for amateur astronomers, selective optics instead of adaptive optics. Awesome channel!

@maximechambefort8012 Год назад

Hi ! Great video and result ! Would you be able to reproduce fresnel lenses similar to wearality-sky-limitless-vr ?

@rafaelschipiura9865 2 года назад

I just watched your video on making monolithic telescopes where you explain aspherical lenses, and then came back to watch this one again. This got me thinking: maybe adding trigonometric components like you use here to other lenses besides the conic and polynomial components could have interesting effects? Of course one can always approximate trigonometric functions with polynomial ones for numerical work, but it might be useful to think in terms of trig functions to get a better model for what's happening, instead of just letting the computer search for polynomial parameters that work. Do you have any thoughts on this?

@yachticus 2 года назад

love what you do

@indrajitR 3 года назад

wow. mind blowing.

@wyomingcreations8824 2 года назад

In the art world I use transparent layers until I get the right thickness to make the light bounce around. And in the 3d modeling world we have ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-UEH5xdGU9T8.html this video. I keep thinking that the wave generator in blender might accept equations - Blender uses python and its easy to make addons for it. But I'm still trying to figure out what your doing and why.

@KimOyhus 3 года назад

I think I could minimise chromatic aberration in a 2 sided design. Should I calculate a design like that?

@Hackanhacker 3 года назад

you can raplace your "([...])" by a time referance like 2020 xD not obligated to highlight covid in your video title xD historian and news will do that !!! i thoughht that was a subject about physics and lenses (that subject dont apply just in covid time lol you see what i mean !?) and theres alredy date aattach to each vids so whyy!!!??

@HuygensOptics 3 года назад

It explains the content of the intro. I did not add it to attract attention to the video.

@Hackanhacker 3 года назад

@@HuygensOptics that wasnt what i said :P sorry it is just a little critic dont take it personnal ;)

@alimehmetaltundag1952 3 года назад

That "party inside" scene, lol!

@stevenw4549 3 года назад

Interesting. I am from an optical background so appreciate your content.

@bytesandbikes 3 года назад

Absolutely fascinating. Thanks for sharing.

@jasperlawrence5361 2 года назад

Thank you for inspiring me to do more.

@jj74qformerlyjailbreak3 2 года назад

29A 111

@pinokio514 Год назад

Huygens Optics , hello. 1) The your program zoneplate_writer is working on the Windows 7x64 . For start you need to unpack archive and rename the file zoneplate_writer.exe.deploy to zoneplate_writer.exe. I'm rename file from zone plate_writer_publish\Application Files\zoneplate_writer_1_0_0_6 .YOU NOT NEED to Install the software for Win7! 2) Your program cannot be calculated by a large lens that is sold in China? I did not understand how to calculate. There is a focal length of 300 mm.Groove pitch: 0.3mm, Size: 7 inch x 10 inch I set in software Focal Distance = 300 000 but I don’t know what to enter in the wavelength and pixel size. ==update: I input next values: Image Size = 3080x3080 Pattern Center = 1540x1540 Pixel Size = 4000 Wavelength = 600

@HuygensOptics Год назад

I guess the software does not like the bigger image sizes for these settings, I have to look into why that is. If you try the standard image size of 1080x1080 and use 540,540 as a center, it will give you a pattern that should work for a pixel size of 4000nm and 300000nm focal distance. The pixel size is the size of the pixels in the pattern that makes the Fresnel lens. The wavelength is the one that you are trying to focus.

@pinokio514 Год назад

@@HuygensOptics I forget to add in "update" that with my parameters the image like is good. Yes, if to use these parameters but to enable "binary" I see a few little circles.

@HuygensOptics Год назад

@@pinokio514 yes that is correct, because the focal length is so long. If you try a shorter focal length, you get more circles spaced closer together.

@pinokio514 Год назад

@@HuygensOptics ok, thanks =)

@edmurray69 2 года назад

Can I make a solar cooker? Those are tiny.

@david203 2 года назад

Yes, you would need a very large sheet Fresnel lens, which are not very expensive. But that is not the topic of this video.

@stanmacdonald1073 2 года назад

I've been working on a project to measure the position of a piston in a hydraulic cylinder using a coherent pulsed radar on a monolithic chip. I've been using a plastic lens to columate the beam in the cylinder. It would be very desirable to use a lens that was close to flat. I've got an aperture that is less than 10 wavelengths and I'd like a focal length close to the aperture diameter. Is this technology remotely applicable? I know nothing of diffractive optics.

@HuygensOptics 2 года назад

I would guess so. of course the scale of your design would have to fit the radar wavelength, but zone plates are know to work with microwaves.

@johnaweiss 3 года назад

Fantastic! I hope to use this for our teen apprenticeship.

@yura979 2 года назад

Quite nice.

@petevenuti7355 3 года назад

Source code?

@killpidone 3 года назад

God bless you for putting out your hobby in the internet

@david203 2 года назад

The app for generating Fresnel zone plates looks nice. But I have a question. The first output you get is the correct zone image, where the rings are fuzzy. This fuzziness in space gives precision to the focal point, since using a zone plate is in effect using diffraction to generate the inverse of a diffraction. But then you generate a final zone image where you convert from grayscale to monochromatic. Doesn't this conversion smear out the focal point and increase color aberration? Forgive me if I'm making an elementary mistake; it has been many years since I took my graduate course in optics.

@HuygensOptics 2 года назад

That is correct. It's just that photoresists handle grayscale exposure badly. So you can choose which is best for your application. For photoresists use monochrome.

@home_Grown_studio 3 года назад

I have always wanted to use fresnal lens in front of my Infrared LEDs to keep some flood but also increase distance magnification if that is even possible..

@david203 2 года назад

That's kind of the reason they are used in lighthouses. Solid convex lenses would be expensive and have light loss due to their large mass.

@appatula 3 года назад

Can you shed any details on the specific photoresist that you use here? or is this a trade secret? I've just subscribed, what a fantastic channel!

@HuygensOptics 3 года назад

for this particular experiment I used Olin 00835 from Ciba Geigi. But many photoresist such as for example the ones form microchemicals.com will do just fine.

@polyhistorphilomath 2 года назад

El amor en los tiempos del cólera.

@raymondzhao9557 2 года назад

coooooooool！

@weeb8812 3 года назад

what if you coat the plate multiple times, and instead of using a fresnel pattern, you use a refractive lens pattern

@david203 2 года назад

I think he described exactly that at one point. He can create very tiny real Fresnel lenses.

@scottr.hampton2474 2 года назад

This might seem a funny question. I build recumbent sociable human powered vehicles. Based on 1932 MG J2 sports cars. I use bullet or Dietz headlights that come with a flat lens and refractory mirrors. I was thinking of using Fresnel plastic magnification sheets to place over the flat lenses to direct control aim and light concentration of these lights. Am I on the right tract?

@HuygensOptics 2 года назад

it might work, but you probably need Fresnel sheets with a very short focal length

@scottr.hampton2474 2 года назад

@@HuygensOptics Now is that the depth of the lens, or the spacing of the rings across the face? I can get those RV backup or book reader sheets. The older Bullet lights have 2 bulbs, one set up higher in the case causing a wider front light casting. I'll be replacing that with LED's (COB) and controlling the power to the LED for high/low. These sheets use a thin lens and very tiny rings. Do you think this is what I'm looking for?