|
|
|||||
|
Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place... The Space and Astronomy Agora |
Foucault Testing 8" F/4.5
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Jim S./">Jim S. on February 3, 2000 18:31:03 UTC |
I'm testing my first mirror (8 in. f/4.5) and can't get the edge to shadow test. The right edge goes into the heavy shadow but the left side stays lit (Knife enters from the right) Do I need to re-adjust the lateral as I test the outer zones or leave it alone? A Ronchi test looks picture book from inside to outside and the surface looks smooth. I'm also having a problem with the edges of the silt showing up in the mirror during testing. If I widen the slit the problem goes away but then what's the fuss about narrow slits and tint pinholes in Texereau. Out to the 70% zone things are as expected. |
|
Additional Information |
---|
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy |
Unless otherwise specified, web site content Copyright 1994-2024 John Huggins All Rights Reserved Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" are trademarks of John Huggins |