Quote:
Originally Posted by Grahame
Gday Peter,
There was no focal reducer in use when the first image was taken. The second image was using a taka Field Flattener.
Grahame.
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Graheme..I have to say this looks odd. Have you adjusted the collimation at all? (I'm wondering whether the secondary is being stressed somehow...fix: loosen all three adjustment screws and gently re-collimate)
I'd also play with the focus. RC's have curved focal planes...often mistaken for coma. I always use stars about 2/3rd's out from the center.
rgds
Peter