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Good job Rick. With a relatively dim object such as this, and a relatively
slow scope, you could do with longer subs, say 4 or 5 mins. The returns
from stacking do diminish, and how many you need depends upon how noisy your camera is at the time of imaging; with an uncooled DSLR the ambient
temp, as you are probably aware, is the main factor to consider. In summer
I found I needed at least 75-100 subs to bring the noise down to acceptable levels. In winter 40-60 did the job. My 1100D was obviously not as quiet as
the higher end models.
Incidentally, your focus looks good, so maybe a tiny bit of sharpening
would finish it off nicely.
raymo
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