Views : 251,425
Genre: Science & Technology
Date of upload: Jun 10, 2022 ^^
Rating : 4.969 (84/10,914 LTDR)
RYD date created : 2024-05-18T01:04:52.13282Z
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Top Comments of this video!! :3
I have an idea how to make the contrast better. I believe a problem with black paint is that it’s not intended to be black to what it’s painted on but rather towards outside observation. This means that some paints rely on their drying process to create a surface structure that helps with absorbing light. It obviously doesn’t do that on the side that’s sticking to the material though. I believe a method that could work well is to use an epoxy resin in which you use something like activated coal as a pigment as this should absorb light very nicely.
I admit I don’t have any experience in this field but I believe this might be worth testing.
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I would consider this to be an excellent result even if it was a 2nd or 3rd attempt, let alone the 1st one. Great job!
28:53 The black spray paint makes the frosted inner surface behave like a reflective diffuser.
I think a less viscous paint would more thoroughly seep into the tiny pits before drying. Spray paint particles might even be too big to properly fill them in (possibly creating a refractive/reflective nightmare of tiny air gaps). A more matte/flat black wouldn't hurt, either.
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Did i just watch three videos with extremly technical concepts, extremely accurate techniques of all kinds, years worth of experience in order to even begin with, about 200k worth on ultra specialized machinnery, months of planning, hard work, tweeking everything to finally compare the product to a cheap 200usd 300mm lens and find out our thingy sucks? lol
Now for real, i enjoyed every second and loved the whole project.
Congrats!
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25:09 your frustration reminded me of this memory:
In the 1980’s I read an article in a Reader’s Digest issue about the mirror for the Hubble Space Telescope’s mirror’s manufacture. The article was the difficulty experienced by the team contracted to grind the mirror. It as to be ground by a computer controlled apparatus of some sort. According to the article (and as I recall it, which may not be very accurate after all these years) the team of engineers and techs, try as they might, could not get the mirror within contracted specifications. It would be ok in one spot but out in another, and correcting the errors over there introduced error in another place.
At the time of resting I recall being rather fascinated. Of course, being in my early 20s and from a small rural area adjacent to an only slightly less small town in Washington state, U.S.A., and having only just barely graduated HS I really didn’t understand any of the technical details. But in the frustration experienced by the grinding team the lead guy, who was considered a sort of magician with lens grinding took the mirror home to grind it by hand.
I am not certain, now, how that could have been possible. And perhaps my recollection ti on if that is incorrect. The mirror was almost 8’ (2.5 m) in diameter and just looking at the picture of it being shaped at Perkins-Elmer (https://upload.wikimedia.org/wikipedia/commons/9/91/Hubble_mirror_polishing.jpg) it’s hard to imagine that thing being transported anywhere. But they were under great pressure to finish and finish they did. The guy who supposed took it home even won some award for his outstanding work and sacrifice to the cause. As I recall the effort drive him to retirement.
Of course we learned later the mirror was defective and had to be corrected in space.
I wonder if the relative smallness of your optic wasn’t just as hard as they experience with the Hubble.
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Incredible video.
As an employee of an optical company, I have an idea. Why must the molds for polishing the asphere necessarily be made of pitch? Polyurethane film is also used in optics, Phich is very well suited for polishing. This is much more stable than pitch and does not deform. The result is still very good!
Big respect from my side!
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Love the videos Mr huygens,i would have learnt so much from you, had you been my university lecturer,there is so much detail here,you include problems,and are open about mistakes made,This is what education should be like IMO,step by step explanations,with details of problems,as well as progress made,theoretical and practical,beautiful stuff.
Your sense of humour is terrific. i thought you northern europeans were born without the humour gene!!
Anyway,im a firm subscriber. BTW i originally trained as a radio and tv technician when i left school,yonks ago.Your explanation of the analog TV transmission system is spot on..
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21:01 that gargantuan wave-front error is a nice touch
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@salmiakki5638
1 year ago
though these videos i'm just drawn to think how much better/faster i would have learned at university if taught through projects like this one. Having to tackle both theoretical and practical/technological problems and solutions in order to achieve a practical goal.
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