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Robin,
I turn off the DSI and run the Canon DSLR 400D. Auto-focus seems to miss the mark (I use a Meade Motorfocuser controller by a JMI USB under ASCOM). So instead I take shots and look at the FWHM on a bright star with 1-2 second shots until things look focused.
The C9.25 being carbon fibre keeps focus amazingly well!
I bought Rod Wodaski's Zone System for Astrophotography (half way through it), or otherwise pic tips up from folk here!
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