Hi Lewis,
I tried something similar, but gave up on it. I piggybacked an FSQ with a DSLR onto a 10" Newt with a mono ccd and off-axis guiding. The DSLR was being driven by an intervalometer to avoid USB or drive issues. Two reasons I gave up - the flexure in the system that the OAG perfectly guided out no showed up in the yak. Problem 2, every sub through the ccd that coincided with the DSLR shutter activating was ruined.
At shorter fl and with an independent guide scope it should work, but you can always bench test the sw and camera combination during the day.
Cheers
Andrew.
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