[ATM] Focal reducers

["Paul Bradley" <paul@paul-bradley.com>]

Hi all,

Just pondering something - if one were to use a focal reducer with a fast (f5) 20" newtonian by moving the 
mirror forward, would aberrations coma etc. be within reasonable bounds across the whole field of a 2/3" ccd? 
I presume coma could become unacceptable because you'd be working at f/2.5 or faster, but does it work 
that way if the primary is f/5 and you're using a reducer?


thanks.

Paul
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