From: "Jack Schmidling" 
To: 
Reply-To: "Jack Schmidling" 


I am trying to set up my 4.25" F 4 for "wide field" CCD
imaging and am have trouble getting rid of coma.

First question, is it possible to get a coma free field over a 1/2"
with this system?

Second question, when collimating on a star, I can not get the diagonal
shadow centered on both sides of focus with the same mirror tilt. If it is
centered inside it is not outside and vice versa.  Is this a symptom of a
problem elsewhere in the alignment?

js


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