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Must say - even when using a focal reducer on the C9.25 and guding with a side by side 5" MAK at 1500mm focal lenght - I got alot of star field shift - like the RA was running too fast. And I mean alot!
Since using the OAF at full prime focus on the C9.25 there is no discernible star field shift after several hours. All my gear was mounted using Losmandy gear - so I wouldn't call it flimsy gear causing shift. Personally I thought the main mirror in the C9.25 was moving slightly as the scope moved about the sky. Just a guess - either that or guiding with a colour DSI was just faulty. I might try guiding again with the Mono DSI II pro attached to the 5" MAK and see if that too exhibits star field shift.
Once the problem is isolated - fixing things is alot easier!
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