I'm not a photographer, I'm actually an optometry student, and your videos are super helpful for visualising! Thank you very much.

I was studying lens abberations for spectrometry courses, this video helped. Thankyou

Very nice presentation. Well explained and more scientific than commercial.bla bla bla.

Hi, just wanted to say that I'm currently studying for my exams which include lenses and optical aberrations, and this video was amazing in explaining it. Loved the clear and well worded explanations, keep up the good work! :)

Excellent description !! I always need good illustrations to understand phenomena - yours are really helpful ! 👍👍👍 Thank you ! 🙏🙏🙏

Your channel channel inspired me to take up optical systems course. It is so fun to learn, also the book by Eugene Hecht on this topic is so well written! I do find a few inconsistencies in this video though.

Many thanks for the videos.

Thank you very much I am student of optic ❤

Excellent and very educative video. The only thing that can make it better are some sample pictures of the aberrations. Congratulations and good job!

Great explanation! I'd recommend including photo examples.

Great channel, good in-depth information well explained.

I was shooting the milky way this weekend and I tried to use the 50mm NIKON 1.8 that I had when I originally bough the camera. I tried to do a longer exposure of about 69 seconds with a tracker, this was the first time I tried to use this lenses for it, because I usually use my Rokinon 14mm 2.8 as I tend to like the wide angle shots. But I notice the coma in the light of the stars as you mentioned in the beginning of the video, as it is a cheap lens, I will try to change the aperture and see how it will look like. Wanted to tell you that I really like your videos because photograph is also the geekiness of getting to explore optics and astronomy, to me just includes all my favorite things. Please keep doing those videos I really find them very helpful and informative. And I am sorry English is not my native language.

Another excellent video , would it be possible to have a video giving an insight into Diffraction ? , many thanks

So nice❤

Thank you❤💓

Excelent video

You're a life-saver!

Not a photographer, biology student is here, trying to learn about microscopy. Tnx

very helpful video

exceptional 3d ray diagrams

Master of optics 👍

Great stuff! I do not understand why the oblique light causes coma?

nice explanation.

Great video! I am an Optometry student and this helped greatly, It probably wasn't as in-depth as I need but it was a great platform for me to understand the basics and build from there. From me and every other optometry student, I thank you for making this video.

thanks! that was very useful

very informative, thank you!

I've watched all your videos from the first post on this channel to the current one. Your explanations of optics are superb. So far you've given a good theoretical explanation on what's going on with the light and the lenses. Really cool stuff. I plan on messing around with some old-school cameras pretty soon. I've been wanting to get my hands wet with silver-based type photography, but I have no camera yet. I don't know if I should buy one, build one, ..., etc. Those 'Zero Image' pinhole camera from China look really cool, but I like the idea of being able to fit a lens easily should I choose to do so. I don't want to become a master know-everything-about-everything photographer, but I do want to become familiar enough with silver-based photography in order to be able to take good clear images, hopefully Daguerreotypes one day, and to develop some general chemistry labs (I'm a chem instructor) that deal with the redox chemistry that's occurring.

I cannot find your video about the Petzval lens. can you please link it to me?

Sensor curvature may resolve not just field curvature, but also diffraction in small aperture values. Nikon already filed a patent.

What's the exact difference between spherical and petzval aberration. They're not the same thing? Would you use an aspherical element to correct for petzval? This is the best lecture I've heard on this. I'm experimenting with trying to kitbash my own lenses and having a lot of fun but everything I put together always has one or the other distortions to it. Interesting that I probably need some aspherical elements to fix it.

Outstanding video. Would it be possible to ask you a few hypothetical questions

Subbed

ME student saying thanku!

3:00 totally wrong, the rays coming in through the centre of the lens correspond to a smaller aperture, NOT the centre of the sensor. Spherical aberration has nothing to do with corner versus centre sharpness. A lens with spherical aberration will be blurry throughout. 9:17 wrong again, that’s simply impossible unless your lens isn’t spherically symmetrical. 11:00 field curvature is NOT swirly broken... And no it’s not eliminated at all, most modern lenses have visible field curvature.