Mirror Lenses Part 2: Testing the Modulation Transfer Function.
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- Опубликовано: 31 май 2024
- 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" 
Наука
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 RUclips 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).
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.
I sure dig your doing things seriously without taking yourself seriously (is there any other way?)
@@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.ruclips.net/video/1AzQ4y_qwrM/видео.html
I respect and appreciate your integrity! (I also enjoy your videos very much.)
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.
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
I am vaguely reminded of "Get Perpendicular". ruclips.net/video/xb_PyKuI7II/видео.html
En par with Techmoan's muppets
You've made my day😂 the best nerd video I have ever watched
@@soberhippie I dunno, I think this steps it up... well, as much as the difference between 3:45 and 4:10. ;) ;)
Hell yeah! Unexpected.
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.
i was already laughing at dr. liam fullersheit 😂
It had the same Smiling effect on me too =)
I am equally impressed that he was able to get friends and family to participate so enthusiastically
@@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. :)
The musical bit at the end was sooo much better than I could ever have expected! Amazing work
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 :)
99%? Man you must be crazy. 99,999 maybe, but i'm not sure.
The number of optical innuendos this man was able to come up with is really stunning.
What do you mean innuendos? The song was about Fullersheits' favorite lens! ;-)
@@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.....
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!
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.
Absolutely have to agree. Amazingly well presented
Dude, you missed your calling....WAY more money in music videos. You ROCK.
He did, in fact, not miss anything
That ending might just be the greatest thing I've ever watched on youtube!!
I am scientist who works in opticsµscopy, 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!
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.
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!
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.
@@HuygensOptics no problem at all, just measure it in outer space.
@@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.
@@HuygensOptics I think we need to lobby for Artemis to put a test pattern on the moon...
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.
The ending alone makes this channel necessary for subscription
You have won the internet for today.
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
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.
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!
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.
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...
Good idea. That would require some remix of the Righteous Brothers...
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
What a lyrical masterpiece! Bravo production value, and after learning so much! Thanks, sir
Oh man, using that reflective disc to verify your shot was correctly centered on the pattern is brilliant!
MOST unexpected ending of a RUclips video 2022 award .. Liam I am sure you now have aperatures dilating all over social media from that MTF/MTV performance demonstration.
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.
Man that ending was incredible! You and your team have taken this channel to a whole new level! :)
That reflection on the video thumbnail just fantastic. 😆
Even with with 20/20 vision, i could not see that end coming. Those lyrics are crisp!
I can now say that I saw something I was TRULY not expecting today. I.... I.... have no words really 🤣
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!!
When we set up the tree, I will put one aside for next time!
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.
All those optical engineering terms at the end worked surprisingly well in that song.
Name of the guy: Sergei Kotikov ;) God, I love this channel and the quality of info we are provided with
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.)
You had me sold at hello, but the ending was pure gold.
This was easily the best family-produced disco music video about optics I have seen this year. Congrats!
Sir. You are a legend and an idol.
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!
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.
Even I am not in optical business, I follow all your videos with pleasure. They always left great taste in my mind. Many Thanks.
RUclips 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 :)
Aa an optical engineer myself I am smiling thru the ending of the video :)
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 ❤
That second-surface bit is quite clever. I've had two of the three lenses you mention, they were crap, as you mention.
Been watching your videos for months, and only now have I subscribed. Forgive me of my sins.
I really hope every student has someone teaching them with the same "clarity" you bring to your descriptions of optics.
In the end, at first thought I was ready to cringe, but man, the quality of the piece convinced me - truly impressive.
I really didn't expect that ending, but I don't mind it.
The skits honestly always catch me off guard and I love them even more for that! This one is the best yet! Loved it!
that ending though.
Perfection!
I might not understand 80% of the things explained in the video but I can tell for sure the ending was 🔥🔥
Great video with a fantastic and creative ending - you did really surprise me there 🙂 Well done!
That musical ending was bloody brilliant, and all the better for seeing the girls dancing finding it hilarious too!
Seeing a new notification from Huygens Optics is always exciting and the viewing is even more satisfying
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!
I just want to say I appreciate how you succinctly summarized the last episode first.
also, nice rhymes 😎
Optics and dancing on the highest level! Spot on, Sir!!! 🤩🥳🤘🕺🏽👯♀️
This guy's is not only insanely knowledgeful of his field, smart, but also funny and talented. That was a great ending!
Making this comment before 1 million subs as soon you'll reach there.
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!
Both informative and entertaining! The ending definitely caught me by surprise, in a good way. Keen for a part three where you correct the error in the other two lenses.
Not at all where I'd have guessed this would conclude... and I couldn't be happier about that!
Very nice series. I spent a lot of my career in semiconductor lithography at Varian (electron beam lithography, both mask making and the beginning of direct write) and GCA (optical wafer steppers). Though my work was in mechanical engineering, you can't work in these companies without learning a lot about cutting edge optics. Your videos are very well done--I'm enjoying them immensely.
This is my most anticipated RUclips series.
I am adicted to this channel... The music at the end is pure joy...
This clip will become mandatory in my optics classes. A new classic has been born!!
Besides being educational, this video was also immensely entertaining. You rock!
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.
Not sure the music video succeeded in making optics sexy, but I enjoyed it.
The song at the end was amazing.
This is the best channel on RUclips for so many reasons
20:00 The 1979 dry disco guitar was all it took to launch optics into the sexy zone. 💃🕺
I came for the optics and left with the "optics". The dance was great to watch!
I make photos and I have to admit, that this is the best channel explaining this things. Thank you Sir.
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.
What the heck!! That's top dollar production quality right there.
My compliments to Jeroen who definitely showed her acting range; from a disinterested, distracted teen, epoxied to her cell phone to an enthusiastic dancer for the hypnotic and spellbinding Dr. Fullersheit! Bravo Girl. As a purveyor of mischief, hijinx, tom-foolery, and shenanigans myself, there is nothing more rewarding than having a young family member join you in the endeavor. There is beauty in passing this trait to the next generation and there is a sweetness only the two of you can share in this success. Forget the number of views!
Have read your pinned comment. Am still leaving a comment for the algorithm because that was absolutely goddam spectacular. My mate sent me a link because he knows I am into 35mm stuff, but as a first time viewer I have begun thinking about testing my old lenses out, and maybe some of my new ones. So while not a part of your community or follower of your channel, I have learned a lot and had my mind blown clear out of my skull at the same time. Thank you.
You are of course very welcome, as is anyone! Even / especially those that have not discovered their interest in optics. The pinned comment was only to explain why I'm not publishing the clip separately.
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 !
I have to confess that I fell asleep on the couch during the video (not the videos fault - I had a rough day). I was woken up by the funk. It was quite a nice surreal experience trying to wrap my groggy mind around what was happening!
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! ;)
Optics: Great Ending. Best technical channel ever!
Optics never looks so sexy 😍😝 the ending really made my day, great job sir!
the final was EPIC !!!! Greetings from Chile :-) 🕺
😄 thats gorgeous🤣 Thx for new format)
That ending has strong Techmoan vibes :D Talking dully about a higly nerdy subject then out of nowhere a funk song with ... unambiguous lyrics appears :D Also kudos to you for that effort since you're not a native English speaker.
Masterpeice! The videos are facinating, supereducational, serious and interesting. But I really love, that you also show us that you are a human-being as we are, awesome human! :) The clip in the end is the best I've seen in my life! Please, keep doing :)
I loved this video before the song and even more after. Thanks for making such great videos!!!
Mate, I'm not even going to pretend half of the stuff you talk about, but I really appreciate your videos. It's all super interesting
:))))))))))))))
quite possibly the nicest video surprise of the year for me, just fantastic
omg that music video was SO unexpected. thanks. it was awesome.
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"
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.
@@derkeksinator17 I am happy with my Nikon reflex lens. But, the "donut-shaped" bokeh isn't for everyone.
That ending, instant RUclips classic! 😍😍😍😂😂😂
Wow! You're the most poptical guy of the internet. Thanks for education and entertainment.
I was watching these videos to understand a bit better my recently purchased 3M-5A lens. I was already finding them very instructional, interesting and relatively easy to follow, but I was not expecting that ending. I had to subscribe immediately. This deserves so many more views.
Excellent video. And a wonderful song. Glad to hear we have the same taste in music :)
The music video at the end was hilarious! Nice video.
The ending in this video is gold .. fantastic
Oh god... all i needed for my sunday minutes was a super interesting optics video with such a great ending!!! I love your videos and this one was just lovely, really... now i can go to bed with a smile! 😊
Probably the best scientific channel on RUclips. Thanks for your efforts.
Excellent stuff as always 🙌
Good to hear about a fellow South African doing cool software stuff!
The ending was an absolute killer! The lyrics are genius 👌 Very sharp indeed!
The music at end was amazing lol
Dayum... straight fire informative/technical content + the ending...who said hard science can't be hilarious 😂
Age of the geek babe
Every video is a treat, but that musical bit at the end was truly special! Hahaha. Just amazing!