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Moh - the QHY5 is far (and I mean FAR) more sensitive than a TouCam for guiding as it's a monochrome camera. Given the same scope of mine (Tak FS60-C) I could immediately notice the difference between my original TouCam 840k and the QHY5 when I got it when trying to pick a suitable guide star. Chalk and cheese. Rule of thumb is that mono cameras of this class are generally more sensitive - period.
The QHY has greater resolution too, resulting in larger image files. Very nice.
Only problem is that, for planetary work, you'll need to use colour filters to get colour, wheras the TouCam is colour.
If you want to get the best of both worlds, there are DMK colour cameras that will do both jobs well.
Last edited by Omaroo; 12-02-2009 at 05:00 PM.
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