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Hi Paul
Other than what I wrote on the Tak Yahoo group, I use the following settings on my EM200 Temma II:
In CCDSoft when I am imaging at FL of 1200mm or more, I set the RA drive correction rate to 0.5 from the default of 1.0.
When imaging at 1000mm or less, I don’t adjust the RA drive correction rate, leaving at the default of 1.0.
When using a separate guide scope (WO 66mm), PHD and Orion Deep Space Star Shooter (original model from 4 years ago) I expose for guide stars in the range of 2 to 5 seconds.
When I first did this test some 12 months ago, it did seem to reduce the star elongation when imaging with the C9.25 at F6.3 which is around 1480mm.
Good luck with solving this – I can fully sympathise with how frustrating this must be.
Cheers
Dennis
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