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Does it take refraction into account when tracking ( ie does it apply King rates ) or just when "going to"?
I only know the Meades in detail, and they operate by using refracted target data, but once there they revert to just dumb sidereal tracking
A dual chip camera doesnt suffer from the probs you listed
but now you have opened another can of worms
A simple tracking rate adjust ( as per yr initial requirement ) wont account for mirror shift etc either
It sounds like you want to model 360deg of motion of yr scope
which is not a trivial rate adjust program
Andrew
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