They are really awesome even if you're there wrong crowd. I have no plans to ever make my own lens, however I really enjoy the technical videos and calm explanations
Even for the crowd that is not into the business. Do you think that Louis rossman, an apple repair man that has almost 2 million subscribers that repair MacBooks!? It’s how he presents things, absolutely precise even if you do not understand a piece!.
I love how you turned the machine into an extremely accurate lathe using a micrometer xyz stage as your toolholder. You definitely have training as a machinist somehow to deduce you could do that. Cutting geometry and relative motion are all that is ever needed for cutting action- and sometimes you find unique ways of presenting that reality to your workpiece- like you did here. Especially liked the indicated tap trick. Your channel is definitely niche, but full of creative genius. Bravo for posting again what you already do, fascinating stuff
For some reason which I do not know exactly why, watching your step-by-step work and learning about how you strive to do something different, new, and interesting gives a feeling of excitement, joy, and satisfaction. Beautiful job.
A shop I worked with used their Bridgeport Type II mill as a make-shift CNC lathe by placing rod material in the collets and mounting lathe tools in various custom blocks in the Angle-Lock vise--using the mill as a vertical CNC turning center ;) Love your content! I just subscribed.
Sir You are my professor in optical engineering field .....explained with high efforts theory With practical......Keep posting such a knowledgeable video ..... Regards Shall san Mumbai India
I love your channel. I have always been interested in optics and telescopes and the knowledge that goes into them. Thank you for feeding my brain lots of great material!
Amazing job! Lens calibration on camera lenses is a big problem, most of the time because of this I skip the repair or change the whole new group, I would like to find a way to calibrate camera lenses, I knew about the laser but no much information about it Thank you for sharing
Bom dia, quero parabenizar você por conseguir entender e resolver os problemas que foram aparecendo. Tenho inveja de você por isso, já desanimo quando minhas soluções não dão certo da primeira vez. Parabéns.
You may find some of the old cam driven lathes and old fire control computers interesting. Iirc there’s an old us navy video on YT that has a very nice explanation of how a function is translated into a cam surface.
This video is pure awesomeness / a real scream , at least three very good quotes. (Very funny / cool). Awesome Hacks with using the spindle on the centering machine for final cut on the cup and also measures for concentricity / roundness. @Huygens Optics what do you estimate the size of your laser spot to be ? Wasn't clear where the reflection for optical axis comes from back from the lens? (Sub titles covered that lol) ? [Which surface ?] I know with some photographic lenses you can use an autocollimator and reflective reference plate/ (plane of the image), and rotate the whole lens assembly and correct the flange to be perpendicular to within arc seconds by rotating the lens and correcting the flange (similar to what you show here with a stationary reflected "spot"). With off axis (at different angular) positions of an autocollimator you can also measure radial distortion in a lens... Just an idea you could use or repurpose your rig for. Also makes me think that if a lens could be mounted you could also machine final precision reference surfaces to the lens in a metal holder or flange / cartridge (rather than grinding the glass directly ?). Not sure how thermal expansion of glass vs. Aluminum / Aluminum bronze affects how you "Grip" a lens element precisely in a fairly permanent / bomb proof way (that doesn't slip or creep or fall out of alignment from being jarred ). ? Is it all optical cement for that ? [Just some ideas maybe for future videos etc. ]. [Carl Zeiss makes a thing that looks like an ironing board with an autocollimator for radial distortion measurements and other lens parameters.]. I think I can find a link. . ---> Just as an aside various folks in the Astronomy community talk about pros and cons of the use of carbon fiber, particularly with refractors and anecdotally grumble about CF for refractors not being so good or mumbling about differences in thermal expansion , CF having a -ve coeff. for Thermal expansion etc. Do you have any ideas about that (I'm not an astronomer, but interested in advanced optical / photonic systems.). I think I can devise some useful stuff / work for your awesome early 80's rig :-)
Hi ED, thanks for all the suggestions. About the size of the laser spot, I think it can be as small as 15-20 pixels on the CCD. On the screen in the video it has different sizes, and that is because of the different magnifications I use to minimize the spot movement. You can use an autocollimator, however if you have a strongly curved lens you might get very differently sized reflections back, I have no Idea how that works out. Basically you are viewing the reflections throught a straw (inside of the hollow axis is only 8mm) so there is very little room to play. Even finding the reflected laser spot is sometimes tricky. But I agree there is plenty of room for improvement. You can keep the lenses in place by using a little nail polish on the sides (between lens and cup) after you have aligned the lens. also use some on the top surface. It is very easy to damage the glass or a coating with this type of tool, both with aluminium and brass. Carbon fiber enforced materials are generally stiff, but the CTE is still quite high because of the resin. I don't see many advantages over aluminium / steel except maybe for the weight aspect or the aestetics. I'm no expert on this though.
May I suggest you to finish you casts with what now is a famous citation “ I hope that you learned something today”. By Louis Rossman, a newyorker apple repairman that has an atitude with his bread provider! Now we know why Leica and zeiss were so expensive optical systems….
Haha. I enjoyed the finish of the project. Too much work for that result. This remember when my fiends ask to me to make some stuff in my cave and I immediately think about the time I'll need to make that "simple task" 😂
Great video, a always. I can lend you my hundred or so pairs of biconcave/biconvex lenses if you need something to train centering;) I wanted to make viewfinders for underwater camera housings, and tried to reverse engineer the viewfinder I had at hand, but I must have done something wrong, as the new lenses didn't work as expected, and I finally gave up.
Thanks. Actually I have looked into this and it is possible. It would simplify the construction considerably, since some degrees of freedom are now intertwined. But since I use this machine so little it's actually not worth the effort at this moment. Maybe I will make a project of it in the future.
Fascinating. I wonder how long it took to become skilled with this machine. I am going to look up more of your videos from years gone by. ps Here am I wondering how to clean the lenses of a cheap pair of binoculars I bought for a few Australian dollars in a charity shop (small enough to hang around the neck when cycling).
I am very fascinated with your videos, the most detailed explanations I have seen anywhere. I especially liked your OLED one. I wonder if you or somebody else might explain why many lens are made in multiple pieces and then glued or pressed together, is it only to use different refractive properties of the glasses or are there other reasons?
Yes this is mostly done to compensate for (chromatic) aberrations. Ideally the dispersive properties of a doublet or triplet should cancel each other out.
I know for sure that is indeed the case. However, making accurate single lenses is very time consuming and therefore expensive. I don't think many people would like to spend a 1000+ euro's on a single lens, especially if they need more than one.
How about a video on how an amateur can re-glue a delaminated set of lens? I've got a few compact cameras with these faulty lens, not worth paying to have them fixed. I'm thinking of making use of an old hard disk drive to spin the lens and glue it. Maybe a cheap diode laser to center it?
I love making lenses, and mirrors. I wish we all could easily get orders to make stuff. Is there a buisness, to person in garage order bidding process. Does anybody know of some way or place to get orders?
Amateur astronomers are some quite special people, there are many brilliant and nice people but many others draw parallels to audiophiles and their irrational preoccupation of equipment quality, spending thousands for marginal improvements in quality so they get off to watching barely improved airy disks and becoming clear examples of the placebo effect, describing optical feats far beyond what the aperture might enable to. Yet they berate you for buying a non boutique OTA that has a strehl ratio of less than .90 "I tell you, can see the volcanic plumes of Io on my Questar 3.5 inch" "Wow! nice photo of Jupiter, the red spot looks nice definitely smaller than some 5 years ago, did you took it with a Tak? probably 6 inch, What!? its not a Tak? its just a mass produced OTA? mmm I see why it lacks contrast and vivrance, also I think it has some spherical aberration you should go get checked that, mmm i think might also have some roughness on the mirror. I have 30 years of experience! so believe me, I can see lighting bolts in the storm with my 99999$ triplet apo Tak, its .98 strehl just cuts thorough seeing, my 50 year old diabetic eyesight its well trained better than any silly digital contraption! photon to retina its the best!"
Why I have watched an entire video of something that doesn't interest me is beyond me.. Must say it was quite a shame for it to not end up being used after all, as I was looking forward to seeing it.
