Re: Unguided Imaging with a SCT
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There is only one way I have found to be able to run unguided SCT's on any mount, and that is by adding a Hyperstar. At f2.2, exposures are rather short.
Floating/flopping mirrors cause much less problems with shorter exposures. The super-wide-field is great for many objects but not so great for others. For planets, I go with video modes and short exposures so guiding isn't very critical there either.
When I'm not using a Hyperstar or shooting planets, I always use an off-axis guider. I would like to play with an on-axis guider someday but I haven't yet made the investment.
Piggyback guiders on SCT's and most other compound scopes just leads to tears.
"Always take the high road. There's less traffic."