Mirror Lenses Part 2: Testing the Modulation Transfer Function.

Рет қаралды 88,255

Күн бұрын

This is my second video on camera mirror lenses. In this part, I discuss lens construction and explain a method to measure the MTF (Modulation Transfer Function), using a few simple tools.
Contents:
00:00 Intro
01:23 The inside of a Soligor mirror lens
02:51 Using second surface reflectors
06:06 problem located
08:25 Measuring sharpness quantitatively
09:30 Introducing MTF-mapper
10:08 MTF explained
12:30 MTF-mapper software explained
15:25 Comparing lens resolutions
18:38 How to make optics sexy (NOT)
Link to part 1: • Camera Mirror Lenses P...
Download URL for MTF-mapper:
sourceforge.net/projects/mtfm...
Many thanks to Frans van den Bergh for building this great software tool. Thanks also to Sergey Kotikov (Сергей Котиков), for pointing out the software to me.
The music video was produced by Dr. Liam Fullersheit, who performed the rap, did the arrangements, mixing, and most of the choreography. Whether our CCO actually succeeded in making optics "sexy" and attractive is still the subject of fierce debate within the Huygens Optics organization.
The video clip was made as a tribute to 70s and 80s funk and heavily inspired by the music of Rufus and CK. If you are into this kind of music, please check out their Topic Page: / rufus - topic .
In case you need to be mention here as a copyright owner, then please contact me.
Because of multiple requests, I posted the Lyrics of the song below. There were a few concerns about the ambiguity of some of the frases. Dr. Liam reassured me that there was no reason to worry, since it is basically just a song of praise about his favorite camera lens.
"It's 2022 and it's high time
to shine some lights on optics
My name is Liam, I'm funk optician
I scan the room with my laser vision
You don't need a high power lens to see
I'll have my MTF on MTV
We'll grind all through the night my dear,
until every surface is a perfect sphere
I can feel your fringes when we interfere
So let's transfer modulation right here
The spread function pointing your direction
Is on an optical axis made for satisfaction
No spectacles needed for you see,
we're a perfect match, chromatically
And dilation is what will occur,
when I focus on your aperture
So if you image me, the way I image you
there are infinite conjugate things to do
Shine your lights on me
I can make you see..anything
I can make you see..anything you want baby
Oh baby, you're so sharp"

Пікірлер: 749

@HuygensOptics Жыл бұрын

Quite a few people have been commenting that the music clip at the end of the video should be released separately. I'm not going to do that. The clip was intended to be an inside joke, mainly for people who have been following this channel for a while now. And although it may not be obvious to everyone, there is a serious undertone in the video clip: it's about how NOT to make a specific subject more inclusive. So by publishing this part as a separate video, it will lose its context and achieve exactly the opposite of what I intended with it. Personally, I'm not interested in reaching a larger audience for my videos, acquiring more subscribers, or "please" the KZfaq algorithm. Especially if that would mean I have to publish content that is not representative for what I normally do. I just want to interact with an audience that shares a common interest (and in this case, likes to be surprised).

@di-li Жыл бұрын

Я понимаю Вашу мотивацию, но должен контраргументировать, что Вы можете найти (!), пусть новую, но всё же, достаточно серьёзную аудиторию, которая сейчас, к сожалению, лишена возможности приобщиться к Вашему контенту. С уважением. I understand your motivation, but I have to counter-argument that you can find (!), even a new, but still quite serious audience, which, unfortunately, is now deprived of the opportunity to join your content. Sincerely.

@user-oj4xh8cg2l Жыл бұрын

I sure dig your doing things seriously without taking yourself seriously (is there any other way?)

@HuygensOptics Жыл бұрын

@@di-li I don't feel that I'm depriving anybody anything. I's possible to directly share the music clip inside its context by using the following link: m.kzfaq.info/get/bejne/Z6eqhJeqxNfbooE.html

@f1shboT Жыл бұрын

I respect and appreciate your integrity! (I also enjoy your videos very much.)

@takanara7 Жыл бұрын

Well, this was the first video of yours I've seen - the clip at the end was quite a shock, but it reminds me of Techmoan videos where he does a serious overview of electronics and then also funny sketches at the end.

@onataltn4596 Жыл бұрын

The ending. The effort, the flow, the quality.... This is amazing and the most unexpected ending I have ever seen for a nerdy topic such as optics... This is pure internet gold

@mal2ksc Жыл бұрын

I am vaguely reminded of "Get Perpendicular". kzfaq.info/get/bejne/rsiPg9x82q-beX0.html

@soberhippie Жыл бұрын

En par with Techmoan's muppets

@aiurforlife925 Жыл бұрын

You've made my day😂 the best nerd video I have ever watched

@DavidLindes Жыл бұрын

@@soberhippie I dunno, I think this steps it up... well, as much as the difference between 3:45 and 4:10. ;) ;)

@fredfred2363 Жыл бұрын

Hell yeah! Unexpected.

@YSoreil Жыл бұрын

The musical bit at the end was sooo much better than I could ever have expected! Amazing work

@BatteryAcid1103 Жыл бұрын

You honestly accomplished something 99% of people would never be able to do. You ended an educational video with a disco song about optics, and it wasn't awkward! In fact, it was incredible! The lyrics, the production value, the groovy beat, everything was done with class. Bravo. Oh and the rest of the video was fantastic as well 😂 I think we've all come to expect that by now, though :)

@MetaJamm Жыл бұрын

99%? Man you must be crazy. 99,999 maybe, but i'm not sure.

@fv538 Жыл бұрын

Ok, the ending had me smiling. Felt like one of those educational kid videos where they have to do something to retain kids' attention span. Except, this is executed in a way that is actually entertaining. Props to getting the family and friends involved, and kudos to them to actually participate. And let's not forget the very informative content of the serious stuff, of course! Thank you for all the videos and raising, or at least keeping up, the 'bar' of educational videos on this, what sometimes feels like, degrading platform. Succes, kijk uit naar nieuwe videos.

@jkotka Жыл бұрын

i was already laughing at dr. liam fullersheit 😂

@JoneKone Жыл бұрын

It had the same Smiling effect on me too =)

@frederikydejespersen6089 Жыл бұрын

I am equally impressed that he was able to get friends and family to participate so enthusiastically

@DavidLindes Жыл бұрын

@@frederikydejespersen6089 and it's that aspect right there that makes me the most hopeful that this will actually work even better than he appears to be hoping for. :)

$@luminousfractal420$

@luminousfractal420 28 күн бұрын

its the secret formula the evil media companies desire but can never have. hes genuine :)

@tissuepaper9962 Жыл бұрын

The number of optical innuendos this man was able to come up with is really stunning.

@HuygensOptics Жыл бұрын

What do you mean innuendos? The song was about Fullersheits' favorite lens! ;-)

@andybarnard4575 Жыл бұрын

@@HuygensOptics Parental advisory required for lyrics such as "dilation is what will occur when I focus on your aperture". And the Dutch are so bloody good at English that you don't get to claim plausible deniability 😀. As well as the male-female ratio which was much more asymmetric than I would have guessed, do your analytics spit out the age profile of your audience? My guess is mostly getting on a bit.....

@HanstheTraffer Жыл бұрын

Dude, you missed your calling....WAY more money in music videos. You ROCK.

@toseltreps1101 5 ай бұрын

He did, in fact, not miss anything

@AuspiciousOncologist Жыл бұрын

Putting aside that ending, which was fantastic by the way, I feel like this video is a far better basic primer on MTF testing than the Zeiss article I was reading the other day. At least it helped me to grasp the concept. In fact, it did a great job at helping me to understand collimation as well. Thanks for making these!

@Molb0rg Жыл бұрын

A guy repairs different optics, oldish one, and compares those times to times (it was some time ago and I even do not remembe, was it a videos on youtube or an article) and there was a comlarison of sarpness of quite similar optics, perception of a difference was there, but it was subtle and hard to tell specifically what and how much - now I see what should have been done in a comparison test, what should have been added in those tests besides just making photos.

@tolga1cool Жыл бұрын

Absolutely have to agree. Amazingly well presented

@theseriousfreak Жыл бұрын

That ending might just be the greatest thing I've ever watched on youtube!!

@drfaus454 Жыл бұрын

I build optical instruments for (very) large telescopes and space. I do a lot of optical design and testing and still learn from these! I also just decided that my summer student project will include these MTF measurements!

@HuygensOptics Жыл бұрын

I have not tried it, but I guess you can even use these tests patterns for telescopes. The main issue will be the distance that is required between the telescope and the pattern. So turbulence can easily invalidate your measurements.

@___15 Жыл бұрын

@@HuygensOptics no problem at all, just measure it in outer space.

@SergeiKotikov Жыл бұрын

@@HuygensOptics You can always use speckle/lucky imaging in this case as you do with every other telescope subject I guess. The first cycle of my scope tuning I just used the Moon - stacked a number of exposures (thus increasing the SNR) and then extracted the frequency content from the stack. I did get measurable difference after the adjustments. So while it is not real metrology, with a more-repeatable-then-the-Moon target and the processing fixed constant, you can get somewhere still.

@bsm117532 Жыл бұрын

@@HuygensOptics I think we need to lobby for Artemis to put a test pattern on the moon...

@marklimbrick Жыл бұрын

The stars are already a target. And the edge of most highly corrected fields are so inferior as to need nothing more than your eyes. I am surprised that for the effort I put into making a big CDK the design edge of field is essentially identical to centre. It will not be made to the accuracy to achieve that, but I attempt it. Many ED triplet apos fail the edge without extra corrector.

@sambrose1 Жыл бұрын

As a full on STEM nerd and very amateur photographer that was always interested in the science behind optics let me say. Thank you for the time and effort you put into these videos.

@borderline-he5nw Жыл бұрын

I am scientist who works in optics&microscopy, and out of the 60 science channels that I follow this is my absolute favorite. By a large margin. Thanks a lot for all the work you put into making these videos!

@funksterdotorg Жыл бұрын

You have won the internet for today.

@Bakafish Жыл бұрын

Okay, that was unexpected. You got a smile out of me. Your family and friends are good sports, well done. I want you to deep dive on that lens correction you teased in the beginning though. In the romantic movie 'Ghost' there was a famous pottery spinning scene, more of that wet lapping will surely bring the ladies...

@HuygensOptics Жыл бұрын

Good idea. That would require some remix of the Righteous Brothers...

@benmcreynolds8581 Жыл бұрын

Haha that's a hilarious idea. I can Invision it now, where the pottery wheel scene is layered over a shot using the lens grinder as a sort of translucent ghost lol

@benmcreynolds8581 Жыл бұрын

DUDE, I love this. I legitimately loved that ending. That was some well written lyrics. You's spitting Facts! Teaching us all where the true focal point is at! Lol -Cheers from Corvallis, Oregon.

@victorcercasin Жыл бұрын

I can now say that I saw something I was TRULY not expecting today. I.... I.... have no words really 🤣

@OccultDemonCassette Жыл бұрын

Oh man, using that reflective disc to verify your shot was correctly centered on the pattern is brilliant!

@grant-is Жыл бұрын

What a lyrical masterpiece! Bravo production value, and after learning so much! Thanks, sir

@petersvideofile Жыл бұрын

Man that ending was incredible! You and your team have taken this channel to a whole new level! :)

@OhHeyTrevorFlowers Жыл бұрын

I pressed the thumbs up button before I saw the ending and now I feel that there should be some completely new button to express the joy I feel from your work.

@AppliedCryogenics Жыл бұрын

The science content is already so great that this episode is like a good ice-cream sundae- with a glorious, Swarovski-crystal-studded, highly fashionable, cherry on top.

@glentyan2505 Жыл бұрын

The brightest, clearest and most musical explanation of MTF ever recorded; Absolutely fantastic and thank you Dr Fullersheit. btw, A Christmas Tree silver ball is ideal for collimating when used in conjunction with the Sun's reflection. Great humour and great videos!!

@HuygensOptics Жыл бұрын

When we set up the tree, I will put one aside for next time!

@hamjudo Жыл бұрын

I bought 30mm ball bearings to use as relatively precise spherical mirrors. That was the largest size available at that source at that time. Christmas ornaments would be better for some tasks.

@CristiNeagu Жыл бұрын

All those optical engineering terms at the end worked surprisingly well in that song.

@selulancie Жыл бұрын

Even with with 20/20 vision, i could not see that end coming. Those lyrics are crisp!

@pedropereira2211 Жыл бұрын

Sir. You are a legend and an idol.

@robertbrooks5888 Жыл бұрын

Sir, I'm not an engineer. I'm an analog photographer using large format 8x10 cameras. I just have to say that I really enjoy your videos. Thanks and keep making more videos.

@user-xv9fe4eo1b Жыл бұрын

The ending alone makes this channel necessary for subscription

@markfallu2389 Жыл бұрын

I really hope every student has someone teaching them with the same "clarity" you bring to your descriptions of optics.

@dmdg Жыл бұрын

I love how you manage to make videos which are incredibly interesting to watch and informative and at the same time throw in some humor that makes me laugh out loud every single time 😂 Thanks for educating (and entertaining) us ❤

@UncleKennysPlace Жыл бұрын

That second-surface bit is quite clever. I've had two of the three lenses you mention, they were crap, as you mention.

@cj09beira Жыл бұрын

that ending though. Perfection!

@dontwanttousemyrealnametol6765 Жыл бұрын

very interesting topic. Do let us know when a funky optics CD is available for purchase so that we can align our optics to our charts properly.

@onurjp Жыл бұрын

That reflection on the video thumbnail just fantastic. 😆

@JoseSilveira-newhandleforYT Жыл бұрын

Great video with a fantastic and creative ending - you did really surprise me there 🙂 Well done!

@Hackasaures 21 күн бұрын

1. Amazing job with the grinding of the lens element 2. Amazing job grinding to the music

@LoriH2O Жыл бұрын

Not sure the music video succeeded in making optics sexy, but I enjoyed it.

@pappaflammyboi5799 Жыл бұрын

You had me sold at hello, but the ending was pure gold.

@excentrisitet7922 Жыл бұрын

I've been waiting for this video for quite some time now. Somewhere in the middle I liked it but I wasn't expecting such a spectacular performance at the end! It was brilliant! Thank you!

@joelkulesha8284 Жыл бұрын

The skits honestly always catch me off guard and I love them even more for that! This one is the best yet! Loved it!

@toseltreps1101 5 ай бұрын

I have no background or knowledge whatsoever in optics and no real application for anything that i'm learning here, but the presentation and communication are absolutely top notch

@craigbaker6382 Жыл бұрын

MOST unexpected ending of a KZfaq video 2022 award .. Liam I am sure you now have aperatures dilating all over social media from that MTF/MTV performance demonstration.

@SubTroppo Жыл бұрын

Well now you've made me feel more than ever like a grumpy old man because, I recall back in the day that I deplored that style of music, but now that I am in my mid sixties, it comes over like a piece of friendly classical music with heavy nostalgic overtones, especially when compared with current popular warbling. Either way, thumbs up to everyone involved!

@mdanilov Жыл бұрын

😄 thats gorgeous🤣 Thx for new format)

@vaakdemandante8772 Жыл бұрын

In the end, at first thought I was ready to cringe, but man, the quality of the piece convinced me - truly impressive.

@awldune Жыл бұрын

This was easily the best family-produced disco music video about optics I have seen this year. Congrats!

@AshT8524 Жыл бұрын

I might not understand 80% of the things explained in the video but I can tell for sure the ending was 🔥🔥

@bunnysuperbad Жыл бұрын

Aa an optical engineer myself I am smiling thru the ending of the video :)

@1995Links 2 ай бұрын

I did NOT expect this level of informational depth. Here I am curious about how we crammed telescopic technology into a camera lens and now I know the MTF is what to look for regarding sharp image replication. I'm so glad to see your channel rising! That outro video is prime!

@RealSamski Жыл бұрын

I make photos and I have to admit, that this is the best channel explaining this things. Thank you Sir.

@sharg0 Жыл бұрын

While I love the depth of theory and practicality regarding optics most of it is beyond me. But this MTF software is most interesting and something I will put my lenses through as well as see if I can use it to choose the best macro setup (extension tubes, built-in or screw on lense/filter). The end.... Now this channel must go viral!

@Casey_Schmidt Жыл бұрын

This is the best channel on KZfaq for so many reasons

@morkovija Жыл бұрын

Name of the guy: Sergei Kotikov ;) God, I love this channel and the quality of info we are provided with

@DavidLindes Жыл бұрын

I was hoping someone who knew a bit of Cyrillic might comment on 9:34. ;) (Also, seems I succeeded in figuring it out, clumsy as my process was! Cool.)

@superchromat Жыл бұрын

Excellent video. And a wonderful song. Glad to hear we have the same taste in music :)

@jasonroos8431 Жыл бұрын

I loved this video before the song and even more after. Thanks for making such great videos!!!

@afryhover Жыл бұрын

Thank you for making this series. I have a Nikon 500mm f8 reflex lens, and I also do astrophotography with refractors and relectors. These videos are very educational and entertaining! Thanks again, cheers 👍 "Oh baby you're soo sharp"

@derkeksinator17 Жыл бұрын

I bet the Nikon one is better than the one he tested. I've been trying to get my hands on one for some time now. At the moment I'm using a cheap "walimex" 500/6.3 which is pretty bad. It gets outperformed by the Nikon 80-200/2.8 and the 300/2.8 (both very beat-up screwdrive versions) refractor lenses. So in my mind the Nikon one just has to be better.

@afryhover Жыл бұрын

@@derkeksinator17 I am happy with my Nikon reflex lens. But, the "donut-shaped" bokeh isn't for everyone.

@das250250 Жыл бұрын

The ending in this video is gold .. fantastic

@paulburrell4120 Жыл бұрын

Seeing a new notification from Huygens Optics is always exciting and the viewing is even more satisfying

@keesnuyt8365 Жыл бұрын

This is one of the few videos that makes me want to click "like" several times. I'm always amazed by your serious content, but this ending was priceless !

@joshzwies3601 Жыл бұрын

Been watching your videos for months, and only now have I subscribed. Forgive me of my sins.

@theunseen010 Жыл бұрын

I just want to say I appreciate how you succinctly summarized the last episode first. also, nice rhymes 😎

@gerardbroek1943 Жыл бұрын

This clip will become mandatory in my optics classes. A new classic has been born!!

@stardustastro Жыл бұрын

This must be one of the most sexiest optics videos I've ever seen 😂 pure gold, I love it 👍🏼👍🏼

@actudoran Жыл бұрын

you've got a wealth of knowledge my friend!!! didn't expect to be really awesome on the dancefloor singing and playing with the technical terms in such clever and sexy way ! bravo maestro! ;)

@linolafettatnet 3 ай бұрын

KZfaq algorithm brought me to your channel. I really enjoyed your way of explaining what you are doing. Not that i can follow it, but i at least can appreciate the work and effort involved in creating lenses/reflectors a little bit more. Thank you for putting that much effort in your videos. Greetings from a neighbouring country :)

@ladedk Жыл бұрын

What the heck!! That's top dollar production quality right there.

@SergeiKotikov Жыл бұрын

Haha, thanks for the shoutout! Glad that could be of help! I did get my lens chart printed on A0 (because I have some seriously wide angle lenses to measure too), but now I'm looking for a sufficiently flat wall to hang it on XD. Anyway, about the song, are you sure optics is your true calling? Cheers!

@HuygensOptics Жыл бұрын

Yeah, Sergey, sorry I did not know how to read your name in Cyrillic. Another viewer tipped me that you can just use Google translate for names too. I did make up for the omission in the video description though!

@SergeiKotikov Жыл бұрын

@@HuygensOptics No worries! Cheers!

@DAN9I Жыл бұрын

@@SergeiKotikov привет, подскажите пожалуйста, на кроп матрицу для фокусных расстояний от 18 до 200мм какие размеры тестового листа будут оптимальны? Для шу а0, понятно😃, а для 35-50-70-135-200мм?

@SergeiKotikov Жыл бұрын

@@DAN9I Я думаю, меньше А1 не получится - там главная проблема - покрыть кадр таблицей на как можно большем расстоянии, т. к. оптика, как правило, расчитана на фокус 'на бесконечность'. Поэтому в теории, можно таблицу поменьше и ставить вупор, но боюсь, что такие измерения будут валидны только для такого же типа съёмки (вупор на МДФ). Я вот астрофотограф - мне интереснее что там на бесконечности, поэтому тут чем таблица больше, тем лучше. Для телефото просто придётся отойти подальше. А0 на кропе при 1000мм фокусного - это примерно с 50м надо шлёпать.

@adityaasopa4031 Жыл бұрын

so happy to see you enjoy everything you do

@JR-mj8ph Жыл бұрын

That was awesome work at the end! 👌

@njemawut Жыл бұрын

Optics never looks so sexy 😍😝 the ending really made my day, great job sir!

@msmith2961 Жыл бұрын

That musical ending was bloody brilliant, and all the better for seeing the girls dancing finding it hilarious too!

@RainMakerNGS Жыл бұрын

Many thanks for your videos ! I learn more about optics on this channel than on the electro-optics masters I'm currently doing :D

@diegopig Жыл бұрын

Beautiful video, really instructive (like always), and the final is amazing!

@WobblycogsUk Жыл бұрын

The song at the end was amazing.

@christophererickson2606 Жыл бұрын

This is my most anticipated KZfaq series.

@iNerdier Жыл бұрын

I just want to say these are excellent videos and I could hear you talk about the physics of boiling an egg and still enjoy it for 20 minutes.

@dexio85 Жыл бұрын

Pure briliance - both in technical part and the creative twist.

@Gractus Жыл бұрын

Fantastic! Easily worth the wait from Part 1.

@alimqave6732 Жыл бұрын

amazing job. waiting for the continue!

@suomi35 Жыл бұрын

This was excellent!

@marceloflores3111 Жыл бұрын

Awesome video from start to finish 🔥

@johnhawk8624 Жыл бұрын

Great vid from beginning to end!

@user-zh5oo1vv7l Жыл бұрын

Absolutely fantastic. Always love the content you provide as it's 10/10 educational whilst still providing some humor. Thanks for all the work you put into your videos.

@bradwalker1259 Жыл бұрын

Loved the ending!

@DucDigital Жыл бұрын

Thanks for the video! Super educational!

@terrance_huang Жыл бұрын

Awesome video, sir!

@DonDayR Жыл бұрын

Besides being educational, this video was also immensely entertaining. You rock!

@PanProject12 Жыл бұрын

Grandiose ! Thanks for this ❤

@marca9955 Жыл бұрын

Awesome video. You put in so much. Thank you!

@agustiortiz8418 Жыл бұрын

Excellent. Thanks for sharing your knowledge and making it fun.

@mceajc Жыл бұрын

The best thing I have seen this week. Fun and educational as always. Absolute brilliance.

@Bebeu4300 Жыл бұрын

I really didn't expect that ending, but I don't mind it.

@davepreiss Жыл бұрын

Loved the content and loved the ending!

@BersekViking Жыл бұрын

Loved the 2nd half of the video! :) And I learned about optics in the 1st part (liked that part as well).

@michaelcato9255 Жыл бұрын

Wow! Great quality science and a show! Very well done!

@Rostol Жыл бұрын

omg that music video was SO unexpected. thanks. it was awesome.

@markatherton7848 Жыл бұрын

Excellent. well done, thank you.

@lorenzogattaldo3764 9 ай бұрын

Great video, from start to end.

@FlappySock Жыл бұрын

Brilliant ending, this channel is really a gem!

@Surukai Жыл бұрын

I came for the optics and left with the "optics". The dance was great to watch!

@niels_channel Жыл бұрын

Wat een geweldige video, love it!!!