Hi, My name is Larry Alvarez. I am building a reflector telescope and I am having a little trouble figuring out what distance I should place the mirror surface of the primary mirror (large one) from the secondary mirror (small diagnol). I have been unable to correctly calculate the distance. Every formula I find online gives me different results. Here are the specs of my scope.

Tube length: 38 inches
Distance from center of focuser to top of tube 6 1/4 inch.
Diameter of tube: 10 1/2 inch
Tube thickness: 3/8 inch
Primary Mirror specs: 8 inch diameter,1" thick, f4.5
Secondary Mirror spec: 1.83" , oval diagonal mirror
I have already mounted the focuser and secondary mirror (diagnol mirror) based on one of the first formulas I tried but I have yet to mount the primary mirror (8 inch diameter mirror). Any help anyone out there could give would be most welcome. Thanks a million,

Larry Alvarez (ARMICHEAL@aol.com)

• RE: How do I find the correct mirror distances - comet61 - October 23, 2000 - 04:44 UTC
  • RE: RE: How do I find the correct mirror distances - ARMICHEAL@AOL.COM - October 23, 2000 - 16:58 UTC
    • RE: RE: RE: How do I find the correct mirror distances - bobmay - October 24, 2000 - 17:51 UTC
  • RE: RE: How do I find the correct mirror distances - bobmay - October 23, 2000 - 22:18 UTC
    • RE: RE: RE: How do I find the correct mirror distances - comet61 - October 23, 2000 - 23:47 UTC
      • RE: RE: RE: RE: How do I find the correct mirror distances - bobmay - October 24, 2000 - 17:48 UTC
• By Diagramming It. - crockett - October 27, 2000 - 20:01 UTC
  • Oops..I knew we forgot something.. - comet61 - October 28, 2000 - 09:14 UTC