🚀 go-pugleaf

In article <1993Jan11.215409.10223@linus.mitre.org>, chaloux@mandolin.mitre.org (Dave Chaloux) writes:
|> ......... 
|> Jim's Mobile now sells a focuser for SCTs that works without moving the
|> mirror (What an idea!). If positions of the mirror on one side of perfect
|> lead to undercorrected images and positions on the other lead to over
|> corrected images you could use this to tune you telescope for no
|> sperical abberation.
|> ..... 
|> Any chance this will actually work in practice?

  It couldn't hurt but there also seem to other problems that
  could also be addressed while you're at it. I don't have
  an SCT but from looking at a friend's it appears that it
  can't be fully collimated due to the movable primary mirror.
  Novak sells a mount which will allow the primary to be 
  adjusted to the corrector plate (which is the way to do it ?)
  after which the secondary could be adjusted. The Novak mount
  seems to have a spot face for mounting a variety of focusers.

  Plus I guess you would want to do the adjustments with the
  scope inclined at 45 degrees (?) as the corrector plate seems
  thin for it's diameter and would perhaps be subject to flexing.

  John Ongtooguk (johno@sdd.hp.com)