[APML]: Telephoto Lenses

[Christopher Scott--WA <73142.1535@CompuServe.COM>]

Peter Ceravolo wrote:

 <<I have built an 450mm f/2.3 (f/2.8 transmission) reflective system that out
performs the finest ED telephotos becasue the focusing optic is a mirror and not
a bunch of lenses. The RMS spot size is typically less than 15 microns. It is
tough getting that kinda of performance with lens systems. Take the Schmidt
camera for instance, it is a perfect example of how reflective systems reign
supreme for image quality.>>

Does that go for refractor telescopes as well???? I have a buddy who is a
refractor nut and would sure like to tell him that one! ;-)


  E-mail from: Christopher Scott--WA, 27-Sep-1996
  Tacoma Astronomical Society
  Board of Trustees
  "Ask me about TAS!"