4 ms·

You wrote up "of course I refigured it" as if refiguring mirrors is something any reader would know how to do. I (and I suspect most of HN) does not; have you

by aidenn0 11mo ago

You wrote up "of course I refigured it" as if refiguring mirrors is something any reader would know how to do. I (and I suspect most of HN) does not; have you (or others) written on this topic?

chantepierre 11mo ago
Sure ! Here are a few links : https://stellafane.org/stellafane-main/tm/index.html https://stellafane.org/stellafane-main/tm/index.html How to make a telescope, by Jean Texerau, which was the absolute bible of this field : https://rexresearch1.com/AstronomyTelescopesLibrary/HowMakeTelescopeTexereau.pdf https://rexresearch1.com/AstronomyTelescopesLibrary/HowMakeT... Here is a talk (in french, but maybe the auto-subtitling would work?) I recorded that overviews the whole process (2h30 though, and lacks info on the Bath) : https://www.youtube.com/watch?v=Wt7lBLS0ueg https://www.youtube.com/watch?v=Wt7lBLS0ueg Here is Gordon Waite's youtube channel which actually shows a lot of the moves : https://www.youtube.com/@GordonWaite/videos https://www.youtube.com/@GordonWaite/videos Best resource on the Bath (french, but should translate well) : https://gap47.astrosurf.com/index.php/technique/optique-instruments/controles-optiques/interferometre-de-bath/ https://gap47.astrosurf.com/index.php/technique/optique-inst...
- aidenn0 11mo ago
  Merci!
- clusterhacks 11mo ago
  Wow, thanks for the link to Texerau. I had no idea a pdf was floating around and have wanted this book for some time. You video looks interesting, especially the part around Ronchi and Focault testing. I have 'Understanding Focault' but have to admit that reading it doesn't give me confidence. One question I always think about is how much time and effort a "one-time" mirror maker should plan on making to exceed the quality of a generic 8" or 10" F/5-F/7 available from the Chinese mirror makers. Zambuto seems to imply that whatever magic happens for his mirrors might be in very long, machine driven polishing to smooth out the final surface imperfections that cause scatter. With his retirement and with few mirror makers in the US, it seems like options for buying "high end" mirrors in the 6"- 10" size are very limited. I have been debating an 8" F/7 and would love to just purchase a relatively high quality mirror, but most of the mirror makers seem more taken with significantly larger mirrors.
groos 11mo ago
I'm sure he didn't explain it because almost nobody knows what it is (or even how to interpret the interferograms he showed) and learning to figure optics takes years and entire books are written on the subject.

by aidenn0 11mo ago

You wrote up "of course I refigured it" as if refiguring mirrors is something any reader would know how to do. I (and I suspect most of HN) does not; have you (or others) written on this topic?

chantepierre 11mo ago

Sure ! Here are a few links : https://stellafane.org/stellafane-main/tm/index.html https://stellafane.org/stellafane-main/tm/index.html How to make a telescope, by Jean Texerau, which was the absolute bible of this field : https://rexresearch1.com/AstronomyTelescopesLibrary/HowMakeTelescopeTexereau.pdf https://rexresearch1.com/AstronomyTelescopesLibrary/HowMakeT... Here is a talk (in french, but maybe the auto-subtitling would work?) I recorded that overviews the whole process (2h30 though, and lacks info on the Bath) : https://www.youtube.com/watch?v=Wt7lBLS0ueg https://www.youtube.com/watch?v=Wt7lBLS0ueg Here is Gordon Waite's youtube channel which actually shows a lot of the moves : https://www.youtube.com/@GordonWaite/videos https://www.youtube.com/@GordonWaite/videos Best resource on the Bath (french, but should translate well) : https://gap47.astrosurf.com/index.php/technique/optique-instruments/controles-optiques/interferometre-de-bath/ https://gap47.astrosurf.com/index.php/technique/optique-inst...

aidenn0 11mo ago
Merci!
clusterhacks 11mo ago
Wow, thanks for the link to Texerau. I had no idea a pdf was floating around and have wanted this book for some time. You video looks interesting, especially the part around Ronchi and Focault testing. I have 'Understanding Focault' but have to admit that reading it doesn't give me confidence. One question I always think about is how much time and effort a "one-time" mirror maker should plan on making to exceed the quality of a generic 8" or 10" F/5-F/7 available from the Chinese mirror makers. Zambuto seems to imply that whatever magic happens for his mirrors might be in very long, machine driven polishing to smooth out the final surface imperfections that cause scatter. With his retirement and with few mirror makers in the US, it seems like options for buying "high end" mirrors in the 6"- 10" size are very limited. I have been debating an 8" F/7 and would love to just purchase a relatively high quality mirror, but most of the mirror makers seem more taken with significantly larger mirrors.

groos 11mo ago

I'm sure he didn't explain it because almost nobody knows what it is (or even how to interpret the interferograms he showed) and learning to figure optics takes years and entire books are written on the subject.