From: "Mel Bartels" 
To: 
Reply-To: "Mel Bartels" 


>>>
Assuming I can baffle the sky light away from the eyepiece are there any
negative image problems which may occur such a added optical aberrations or
excessive coma?
<<<

No - a flat is a flat is a flat.  The biggest issues are baffling, and
apparent diagonal outline (at some angle of reflection, it's better to go
with a spherical flat than a traditional diagonal that's shaped 1.4:1). You
may also want to include a tertiary flat right underneath the focuser to
make the 'look into the eyepiece' angle as comfortable as possible.

Mel Bartels

--- BBBS/NT v4.00 MP