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The coma runs along the RA, consistently top to bottom. I guess (to be confirmed, the further from the centre of the optical path the worse the coma).
On a DSLR imaging chip (Canon 400D) there is very slight coma at the edges of my shots.
The OAG version - its a one 1 year old 3" Lumicon OAG (about 8 inches long) specifically for the C9.25 SCT. I've removed its focal reducer removed - as with the Focal Reducer in the coma was horrible on the main DSLR imaging camera.
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