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hi tanja i have a very similar setup to you and have asked these questions to our iis members and the concensus is that OAG seems the way to go due to the differential flexure alluded to by one of these posts
over the last week or so i have picked up both a 60da and a lodestar mono camera
i am still unsure about backfocus and length of the OAG etcetera, but i thought i could hook the lodestar through my 50mm finder to experiment first as a guidescope
my g11 seems to be able to do a 2 minute exposure unguided 8 out of 10 times anyhow, so once guiding progresses hopefully i may get 4 or 5 minutes
pat
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