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I use the colour version of the QHY5L-II for both guiding with PhD and for planetary imaging. It was useful to have the colour version of the webcam for planetary imaging before I had LRGB filters. Obviously, it would be better to get the mono version if you already have a set of filters.
PhD and the QHY5L-II work pretty well together (using on-camera ST4 guiding). Apart from the odd galaxy target with only dim stars nearby, I get plenty of guidestars at 1 sec intervals using either a Skywatcher guidescope or Skywatcher ST80, normally guiding at about 1000mm focal length.
I couldn't get MetaGuide to work as reliably as PhD. When I did get it working it was no better at guiding.
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