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Good job Kev; a few people use 3, 4, or even 500 short subs. I hope you
don't mind if I briefly reply to Chris.
I and others have found after extensive experience with Canons, that the budget level ones have a sweet spot of ISO 1600. The more short subs you stack, the quieter the final image becomes, but of course you won't capture the detail that long subs do. I have attached an image of 1365 that I took
early on in my digital AP which had no darks, flats, or bias frames.
40x 50secs @ ISO 1600. Unguided, hence elongated stars.
raymo
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