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A couple of final points Chris. Stacking does not sharpen images at all, it
just improves the signal to noise ratio, as Dunk said. It is important to
check all subs, and only stack the good ones, as one or two poor ones can seriously affect the final result. Elongation of stars due to wind, or a tripod knock can ruin the whole stack. M42 is one of the hardest DSOs
to image well, owing to it's huge dynamic range; it requires some processing expertise to stop the bright core from being totally washed
out. I would suggest starting with something else.
raymo
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