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The chip on the ZWO ASI120MM is small (1/3"), which is why you are only getting part of M42, for instance. The camera is not cooled, but the Aptina MT9M034 sensor (CMOS) is relatively low noise (and very sensitive!). It's a terrific autoguiding and planetary camera, and, as you've seen, as servicable DSO imager for shorter exposures. I've never tried DSOs with mine, but might give it a go on narrow field, on a cold night!
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