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Sorry i got to this post so late, but i have the Vixen VMC110 as a guide scope on my 20" CDK, and its great. Perfect for the long focal length, and no mirror flop that i can see, probably due to its small light mirror size.
Anycase, it makes a great guide scope.
I use around 2 seconds exposure on 99 % of my shots, and its fine.
Theo.
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