[ATM] conic constant

[John K. LaShell]

Jim Burrows wrote me, "If you can ask ATMOS what k is for a sphere, then for a parabola, and the respective answers are 0 and -1, then they're the same." I checked and that appears to be the case, so I conclude that b (Texereau) = k (ATMOS). Thanks.


  ----- Original Message ----- 
  From: John K. LaShell 
  To: atm at atmlist.net 
  Sent: Wednesday, January 23, 2008 12:52 PM
  Subject: conic constant


  Hi, everybody. I'm working (very slowly) on a 12.5 inch f/3 Gregorian. Is the conic constant "k" in ATMOS the same as the coefficient of deformation "b" in Texereau (2nd edn. p. 77)? I enjoy the posts on various subjects & have learned some valuable lessons. This is my third scope -- I've done two 6 inch Newtonians.
  John