ATM 1st mirror goal - overcorrected

["Tom Krajci" <krajcit@det5wg57.barksdale.af.mil>]

I'm grinding my first mirror, a six inch, f/4.5 that I plan to figure 
to complement a Lumicon 48mm aperture coma corrector.  According to 
Lumicon's literature they recommend 20-25% overcorrection.  The 
question I have is:

How does this degree of overcorrection apply to knife edge test 
readings?  Do I simply increase the expected knife edge travel for 
the same R of C parabola by 20-25%?

Tom Krajci
B-52 Intelligence Officer