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Paul
I use a rotator with my CDK 12.5 - its an Optec Pyxis 3", a very nice piece of kit.
I need it for my set up. Without it, I can't be guaranteed to get a guide star. I image with a STX16803. It took me a while to sort out framing - my FOV in TSX did not match my set up - once I fixed that up with a custom FOV indicator it works like a charm.
I use CCD Navigator to select targets and set goals. It also frames the images so I have a suitable guidestar. That integrates nicely with CCDAP so I can prepare an imaging run over several targets for a series of nights. I then let CCDAP start itself, frame and commence imaging. Without a rotator I'd be fiddling with framing every night - and not getting the real benefit of automation.
I've not used a flattener so I can't comment on that.
My 2 cents worth
Pete
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