Quote:
Originally Posted by [1ponders]
I'm seriously thinking of going that way next Fred, but how do we explain the shifting focus. Loose mirror clip?
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SBS guiding is no good at 1800mm FL, whether you do it now or later makes no diff, youll have to in the end anyway (or OAG). A (guide) refractor is heavy at the front and the RC heavy at the back, different flexure=extra grief.
When (not if) you mount the guide scope on the OTA, bolt everything down hard (incl guide cam). No rings, clamps. If the guide cam is waving in the breeze miles from the scope with a wobbly focuser/draw tube, then bolt the Guide cam to the guide scope mount rail too, Guide focus is not critical, doesnt need adjustment after initial focus, just bolt it down after focus, reduce drift.
Focus is a different grief, worry about that after you ditch the SBS.(BTW the weight saving ditching the Losmandy SBS gear will help no end).
At 1800mm FL solid is everything.