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The QHY5 images in that post are very nice indeed, the M42 Trapezium region is a cracker of a shot! The exposures seem to range from 3 to 5 seconds and there is some evidence of “hot pixel” trailing. Some horizontal banding is also noticeable in some of the images, although one poster writes that this effect was removed in his camera, just by re-routing an internal wire.
Another consideration is, “are you a tinkerer? That is, do you want to take long exposure, colour images “out of the box” or are you prepared to tune and fiddle with the HW and SW?
Finances, the quality of your mount and long term aspirations in astro photography also come into play of course.
Cheers
Dennis
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