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hi Russ. I was not concerned so much about exposure length, but about imaging while dither is taking place.
Maybe going through the sequence will show what the concern is:
scope 1 and 2 are taking images that start at different times and with different sub lengths. Scope 1 finishes a sub and then instigates the dither, which moves the mount to point at a slightly different part of the sky and recommences guiding. When the mount has steadied, scope 1 starts the next sub. In the meantime, if scope 2 was in the middle of a sub while all this happened, that sub would be ruined by the dither offset. The only way around this is to synchronise the times at which the 2 scopes expose subs so that scope 2 doesn't try to image while dither is underway. I don't know how to synchronise the timing of two capture programs - do you know if it can be done?
Of course, this would not be an issue with two mounts....
Last edited by Shiraz; 15-08-2015 at 02:46 PM.
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