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Sorry to jump in on the thread, although it may be relevant, but I wonder if an Off Axis Guider would be of greater or leaser benefit. Specifically I wonder if a long heavy reflector on an HEQ5 would be better served from guiding at a finer image scale or the larger image scale? The finer image scale with on OAG (or long focal length guidescope) would magnifying seeing I guess and result in a steadier stream of fine guiding corrections, and the larger image scale with a finder guider would assist in nullifying the effects of seeing perhaps and result in more definitive guiding related to various PE and alignment errors? When the motors are being pushed by a heavy scope what would image scale would benefit guiding the most? Sorry for all the Qs and hope that makes sense.
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