View Single Post
  #16  
Old 19-12-2018, 03:57 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Quote:
Originally Posted by multiweb View Post
Last question - QE(Ha). For the QHY9 the curve with microlens says ~45% @ 650nm so I enter 0.45 in that cell right?
Yep. No special reason why I used the QE for Ha except that I seem to capture it frequently It would also make sense to put in an average QE over the visible range but it's tougher to estimate.

Quote:
Originally Posted by multiweb View Post
PS: central obstruction by area or diameter?
By diameter like what is normally quoted in specs, e.g. 45% obstruction would be 0.45.
Reply With Quote