Even though this is my longest video so far, it was still only possible to discuss a tiny fraction of the aspects of optical design. Things like MTF, PSF and wavefront errors were kept outside the scope. However, I hope I can make up for some of this in the follow-up video. Also, If you have specific aspects that you want me to dive in a bit deeper, please comment to this post and maybe I can discuss these as well. By the way, sorry about my pronunciation of the word "radii". I used the Dutch way of pronouncing it and not the correct English / American way. Also the "Z" symbol allows for multiple pronunciations, the one I used might not be the one of your personal preference.

@christopherleveck6835

2 жыл бұрын

I have been fascinated by this subject and looking everywhere for more information and even started working on my own process to make a mold for using liquid optical acrylic.... I'm using a cnc lathe with a single point cutter to create the mold halves. I can make the lens any shape that can be created in a computer.... I can also cnc grind a lens out of solid glass....

@superchromat

2 жыл бұрын

When I was watching I tried really hard not to move my mouse so I wouldn't get a sense of how much time was remaining. I didn't want it to stop. Really fantastic stuff. Glad to see you back at it!

@janzkrs8006

2 жыл бұрын

I would love to watch a video about MTF, PSF and wavefront errors if you decide to make it!

@adrianpip2000

2 жыл бұрын

I have little knowledge of optics, so I'd love more in-depth explanations of the other specifics you mention, but I'm also looking forward to the practical aspects!

@theunknown4834

2 жыл бұрын

slight error on 12:40 a_6 instead of 2 a_4, nothing much :P

I studied physics at university, and I am always shocked how little we (physicists) know about optics when in comes to practical design considerations. I love this video(s), looking forward to similar videos in the future!

@chatch15117

2 жыл бұрын

The difference between scientist and engineer. We lean on scientist for the absolute truth/theory. But we have to bargain with reality about what's possible to manufacture and make profitable

@kylebowles9820

2 жыл бұрын

Complexity theory; must be much easier to find the equation than find a state of the equation with properties you want

@JinKee

Жыл бұрын

There's no difference between theory and practice, **in theory**.

@tsraikage

3 ай бұрын

as a physics major myself, I can't agree more. this videos are like alchemy for me at first and then somehow make sense after second thought and gotcha points

@David_Hogue

17 күн бұрын

As an engineer trying to learn physics I am surprised to find myself getting into optics through physics, but it seems like a next logical step.

As a lens designer, this is a fantastic introduction into the crazy world of optical design! I'm excited to see this project be manufactured.

@iancarr8623

2 жыл бұрын

Lens designers for the win!

@romyaz1713

2 жыл бұрын

how do you become a lens designer? what degree is required?

@halonothing1

2 жыл бұрын

As a hobbyist level engineer and a person who is deeply passionate and appreciative of all things engineering, I just want to say I have a great deal of respect for you knowing what your profession is. I have a great deal of respect for anyone involved in the sciences in any capacity.

Oh my goodness, this is so excellent! I have an ancient degree in physics had been interested in optics for a long long time. I knew "about" many of these designs and some of the math. But for the first time you put it together in full and comprehensible explanations. My goodness you tackle the subject so well. I've learned so much from this video. Thanks more than I can express. I think your video, How big is a photon?, is groundbreaking. I'll take an easy guess and say that only a tiny fraction of physics PhDs would get the right answer to your single-photon unequal-optical path interference experiment. The video should be mandatory for all physics students.

Thank you. It's a genuine privilege to have access to a presentation like this.

Fantastic information, thanks for sharing it! Really helpful to see an expert walk through the optimization process and explain different details, pros/cons of choices, etc. Looking forward to the fabrication video!

@HuygensOptics

2 жыл бұрын

Yeah, first I wanted to put it all in one video, but that was just too much information at once. I hope that I will be able to finish the follow-up in a few weeks time.

Can’t wait for the next part. In university I learned about the theoretical process of designing an optical system but I never learnt the practical ways of making lenses or curved surfaces for mirrors. Especially aspherical ones.

Hells Bells ... I thought I knew a little about lenses, but you utterly blew my mind within six minutes!!! Fascinating project - I'm going to savour each and every one of the videos in this series.

Fascinating. Can't wait to see the practical aspects in follow-up videos.

Very enjoyable video, thank you!

Thank You for your detailed yet broad treatment of this project! Your narration is clear (the Dutch accent is just icing on the cake!) and your pace is perfect-keeping my attention without blurring past the subtleties *or* dragging things out. Fantastic! This re-kindles the love of optics that started for me when my father first showed me the moons of Jupiter through a 60mm spotting scope when I was 6 or 7 years old. Thank You for this quality content 🙏🏽

your approach to explaining the theory is on point for the laymen (me), perfect 😀👍

Being a physicist with major optics, I can only say I admire what you did here. Great teaching skills.

Your explanations were very easy to understand, good video.

Optics has always fascinated me, but honestly, I know little about optical design beyond what I know from high school. This introduction is a WOW for me! Thank you for this.

Your systematic approach to the project, the design, and the explanations, is at least as educational as the the optical design knowledge you are sharing. I find myself feeling like an apprentice in the workshop of a wise master. Thank you.

I can't wait for the next one.... I'm going to try this. So please don't leave us hanging too long...

I loved the video and the level of detail you provided. Can't wait to see your manufacturing techniques and testing methods.

In my 20's I tried to make a Schmidt plate with the original vacuum method, pretty much manually like he did back in the day. It was very hard work because I was afraid of losing some vacuum during fine grinding and polishing (like he was also). So I had to work for a long day. I made the pan from concrete, ground lip flat, installed the valve and sealed the pan carefully etc.. To decrease amount of deflection I did both sides of the plate. Unfortunately I indeed lost - for some reason - some vacuum when working on second side and started to have difficulties with the contact etc. and finally gave it up having become too tired of it. However first side looked visually correct on the flat, so it wasn't a complete failure. And at least I got quite a lot experience from that technique which certainly has some challenges and limitations. I remember solid telescopes were presented in one of the ATM 1-3 books which were my "bible" in those days. Perhaps a bit outdated even then but full of enthusiasm about optics and telescope making. Thank you very much for the interesting videos. One of my favorite YT channels

Omg, I am so exited for this series. I love tinkering and getting the absolute maximum out of a design (although in my case, that’s algorithms). That reminds me how I used GDC recently myself for designing a real item. I had to measure a weird corner of my apartment for some shelves, totally not rectangular. Parametrized a quadrilateral, defined an error function to my measurements and used GDC to minimize it. The CNC cut plywood shelves fit perfectly.

@mars5train601

2 жыл бұрын

Hey, what is gdc

@xelaxander

2 жыл бұрын

@@mars5train601 Gradient Descent.

Great stuff as usual. Looking forward to the rest of this project.

I have never done an optics project, and your videos are a great guide on how to do things. Thanks!

He’s back

Thanks - that was great! Looking forward to part 2.

I only have a shallow understanding of mathematical formulas, but your videos is by far the most interesting on YT. Amazing experiments!!

Unbelievable. What a gift. An expert yet easy to follow explanation. Thank you so much.

I barely know anything about this subject but have been waiting for this video for a long time :)

Sir, your videos are the best advanced DIY ones around, your builds compete with professional scientific instrumentation. Not sure I'll ever use this, but I learn a lot. Respect and thanks!

Really looking forward to the next videos! You explained everything super well, even for a simple chemist like myself

@HuygensOptics

2 жыл бұрын

Thanks. Maybe that is because I'm a chemist by education too!

As always a video which conveys information to a very wide audience. One optics topic which I've never understood but always found interesting is Semiconductor lithography masks and the magic which is done to improve resolution with them.

Thank you! Very interesting. Looking forward for continuation

Wow. I have only just stumbled on your videos. I am honestly in awe at the quality of this work. In terms both of what you have DONE, and of how you have explained both the optics and the optical engineering. Fascinating and so well presented. An absolute treat.

I am spellbound, looking forward to the next chapter.

I watched this in multiple sessions, absolutely amazing!

WOW!!!! I'm going STRAIGHT TO PART 2 NOW!!! This is SOOOO INTERESTYING!!! I LOVE IT!!!

Absolutely wonderful to watch. I'd wondered what's been keeping you so busy and this is well worth the wait. Scratching a deep itch that I've had since dropping out of optical engineering / lasers & photonics studies in college.

Sometimes the algorithm blesses us with god-llike content like this. Thank you for the amazing video, waiting anxiously for the new ones!

Optics is a truly fascinating science. I'm a software engineer, but lately I also have re-discovered my love for mathematics while learning cryptography, and optics also seems really fascinating the way you describe it in your videos. Your video on optical logic gates is also amazing, and it really made me think if optical computers can be made. Thank You for making all of this content fore free. Regards

Can't wait to see the next video!!

Truly appreciate your explanation. You helped to connect a couple of concepts in my mind.

Hi Jeroen, thank you for taking the time to share your expertise! Your videos are a truly unique contribution to KZread. I’m a materials science PhD student, and I love watching your videos after a long day in the lab. Greetings from california!

I'm very glad to have found your site. I'm not sure I'll ever get beyond optical design and manufacturing as black magic but I'm learning a lot. Thanks!

Sir, I sincerely appreciate your video. I am looking forward to the follow-up part II.

fascinating practical case study (very synthetic, too), thank you ! can't wait to see the characterization procedure and result presentation...

As a CS grad I was excited to see numerical optimization popping up. I almost jumped the gun and mentioned getting stuck at a local minimum after your first discussion; good thing I waited lol.

Your explanations are always so incredibly clear and easy to follow! Optics is fascinating. Thank you!

Another wonderful video, thanks. My experience with aspherics is limited to the 6" f7 parabolic mirror I ground and figured about fifty years ago. Keep up the good work. Groeten uit Wenen, Scott

What a great video! I learned so much! Wat een fenomenale uitleg! dank u zeer.

That was a lot of insight in a tiny package. Thanks!

Cool. Very nice. Learning about optics and this is very helpful. Looking forward to all the follow ups.

As always with your videos it was pure joy to watch and learn!

Brilliantly articulated I was able to follow your explanations of the theory and have a just a rudimentary understanding of the subject. You gave a lovely overview with just the right amount of detail without me getting lost. Much appreciated :)

The algorithm somehow knew I'd like a video about shiny high precision optical stuff.

Very interesting and clearly explained. Any university would be fortunate to gave you on their faculty..

Fascinating!!!!!!!! 👍🏽 😎 I learned a lot but still have a lot of questions. I'm ok with that and I love it! Gracias!

I had to cross check if I am watching a royal science society channel.. Amazing explanation of light physics involved..

You are my favorite person in the world!!! Amazing all around. Ur videos help me a lot even in fields and subjects not specific to ur videos, but the same math applies.

Am thankful u took the time to focus on this topic.

I just want to say, I love you. This is wonderful. Apart from making me understand how a polynomial works, you really opened my eyes to the world of optics. Keep doing what you do, and please do so with the knowledge that the world is better off because of you. you are wonderful.

Ah, so nice seeing an application of my Math lessons from the Gymnasium.

Highly informative and well communicated as usual! Thank you.

Really happy about that series!

just wanted to say i really appreciate the captions, thank you for taking the time to add them

Thank you, you really know what is going with optics.

Another magnificent imaginative illuminating clear and focused video. Thankyou.

Very interesting………we were provided with a basic re-iterative computer program to refine a simple optical lens design way back in the late 70’s. I was grinding my own Newtonian mirror at the time as a personal hobby and using a homebuilt Foucault tester. This material helps me to know how much further the designs can be taken.

This is the greatest channel

Awesome video I learned a lot. Made me dream of a microchip made of glass where all logic gates are just assymterical edges inside the glass.

I always learn a lot from your videos - looking forward to the next part in this series!

Excellent! I am envious of your knowledge and passion.

So clear, thank you. Funnie that the simplest shape does a good job. I mean that the lens formula is simple. We dread the idea that that would not have worked! zSailors would have seen blurred ship images..anyway, it is a mysterie to me how they used the eyeglasses on their wobbly oak boats..

@HuygensOptics

2 жыл бұрын

By making them long and heavy, the inertia could serve as a crude from of image stabilization.

@KallePihlajasaari

2 жыл бұрын

@@HuygensOptics The opposite of what one would intuitively seek when making a hand supported and guided everyday tool. In a way a design difference between nautical and terrestrial telescopes that no-one has heard of but would be a perfect micro plot twist in a story about a Victorian spy or Sherlock who gains a clue by simply hefting a telescope and knowing it was not a genuine one for the stated purpose.

Always an interesting, and CHALLENGING presentation!!

Well...since I do not plan to build my own optical systems I didn't find any "usefull" information. What I found instead was a lot of very interesting information! Thanks for sharing all this knowledge and insights in this topic!

My jaw dropped. Congrats for this very informative video tutorial. So inspiring.

hello, i really love your channel with the right mix between physics / engineering / practical things / theoretical things / ... you mentioned that thats your longest video so far, but i think this style (20 minutes) that you make fits really good for the viewer (attention span / depth of details) ... thanks a lot for your work

Absolutely fantastic information always! Everyone always says there is a tradeoff between ease of manufacture of sphere-shaped lenses vs image quality of aspheres, but this video finally starts to get into it, including starting to quantify how big the tradeoffs are in both quality and difficulty. I'm super excited!

Edit: You answered all of my questions as the video progressed haha. Adding additional degrees to the polynomial was going to be my question. Radius of curvature appears all over the place in math. Differential geometry and analytic number theory are what I've seen but probably algebraic topology too Edit2: Great material for a trig class for highschoolers. Also pot 'holes' are the method of machine learning people used for gradient descent (now everyone uses "DeepMind", but it has GD has 50 years of usage behind it)

@frollard

2 жыл бұрын

That swiss cheese example definitely hits it home on how a 2d plane is difficult to find a minima...the search space for these nth degree polynomials just grows to absurd levels.

This is such a great video, thanks for making this. A ton of key details packed into a 20 minute video and I cant wait to share with my technicians who love to learn about the optical assemblies we build (satellite earth imaging telescopes)

Wonderful video Huygen, very keen for subsequent episodes.

I never seen such detailed information about design optics, thanks for sharing, eger to watch next part of vedio .

Excellent work, excellent style, love to listen your speech. Never mind about the length of the video. Your videos are not for tik tok followers.

Absolutely awesome content - all the time and effort you put into this is greatly appreciated

Fascinating and very clearly presented, thanks!

Thanks, very interesting. Looking forward for the manufacturing process.

Thank you for sharing. It's not like I'm going to make this myself, but it helps me understand what my telescope does 😂

Absolutely fascinating video, and a simple, patient explanation for laymen like myself. Cheers.

We are currently doing polynomials and conical graphs in school. My mathematics teach will love this video!

Quality channel. Thank you for everything you’re doing.

I'm so happy I found this channel

Thank you so much. Very excited for the next video!!

This is such a fascinating look at optics. Thank you.

it's really interesting to know that in general case optimal surfaces are messy and instead of deriving them analytically (which is something i'd expect in this case), people just approximate them with polynomes and optimize. I had no idea.

Fantastically interesting video! Thank you!

The part you showed about the polynomial coefficients of the aspherical lens was very revealing.

again a very cool video. Nice to understand and a very interesting topic.

Amazing. Can't wait for next video.

That was extremely informative, thank you for that video !

Your video is entertaining. Can't wait for the next one.

dankje voor de mooie uitleg. ga zo door en hopelijk zien we vooral meer in de toekomst

When I watch videos from content creators who are experts in their field, I have a comparison metric that I call the Leibowitz Factor. That is how likely the content creator would be recognized as a saint who preserved technical knowledge in the dark ages of ignorance. You are definitely a candidate for technological sainthood.

@KallePihlajasaari

2 жыл бұрын

Nice, that was a twisted tale, I want to find a copy of the sequel with the Wild Horse Woman. Heh heh, took it out on 14 day loan from the Internet Archive lending library.