Searched CN and used google to find archived thinking on many questions but these are less definitive than I can determine. Would appreciate some comments if anyone is inclined.
1. I'm reading David Harbour Understanding Foucault for mind expansion. Read these back when, will relook at Tex, Brown, Ingalls, Thompson. Harbour suggests using a modification of Everest's stick pins vs the Couder mask for Foucault testing. I'll be using a fixed source knife edge for testing if that matters in the choice of mask and I don't intend use digital images to assess the surface. Question is: Is there a preferred mask for manual assessment of a mirrors surface? What do you like?
2. I have a 8" f/6 Dob built a long time ago with a with Zerodur (IIRC) mirror purchased directly from Discovery. It has made it's way back home. The original spider is a curved affair which is going to be replaced with a stainless steel 4 vane spider. Question is: Do I leave the spider native shine, buff it up or paint it? If so what color?
3. Software suggestions for fixed source manual analysis of Foucault readings would be great. I can't seem to run the old DOS programs, Tex, etc. Any suggestions are welcome. I'll build a spread sheet if needed but a canned program would be cool. Don't mind paying for good work. Question is; Are there any new programs for manual analysis of Foucault readings, with fixed source?
Thank you for your time and thoughts. Even if you don't respond that's fine there is lots of good reading here.