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A great start Paul. I shot this one a few times now and last time with the AP140. It is very dim.
I am not sure 20 min subs is the way to go with an 8300 chip on a fast refractor though. There are about 20 stars in your image that are blown out.I usually limit them to 5 minutes with the ML8300 to protect those bright stars from being overblown. With low read and dark noise cameras like this one and the FLI there is theoretically no gain to 20 minutes. With a noisy camera yes there would be.
Greg.
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