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Hi Peter, you seem to have 2 problems here. Both are fixable. The first, the light bloom in the centre is caused usually by uneven illumination of the CCD. Flat frame calibration will usually fix this without too many problems. The only other fix and I doubt this is possible is a bigger baffle tube and focuser.
The second problem is a reflection problem assosiated with the main baffle tube and is fixable with flocking of the baffle tube.
These problems/ aberations are fairly normal for most RC/SC scopes with 2" focusers and 2" baffle tubes.
I hope this helps.
Last edited by Hagar; 23-07-2009 at 09:32 PM.
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