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Personally for planetary I would steer away from 900 now as it is old tech although it does have a high frame rate compared to many others it has a smaller resolution in comparison.
Most people buy the 900 because it can be modified for long exposures for fainter planets or bright nebs.
CMOS is noisier than CCD but some people have had good success with HD including myself (not lifecam).
I am yet to try guiding application myself as it doesn't appear to receive many stars to guide on, but I have only tested it on 1500mm FL which is not a good test.
I am investigating a webcam software that can stack image in real-time and see if it can record the stacking as well.
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