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Old 19-03-2010, 10:42 AM
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Octane (Humayun)
IIS Member #671

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Join Date: Dec 2005
Location: Canberra
Posts: 11,159
David,

1. are you taking your dark frames immediately after shooting your light frames?
2. how many dark frames are you typically stacking?

You simply do not need to shoot bias/offset frames. The bias is included in your dark frame. It is automatically subtracted from your lights via the master dark.

Bias frames should only be used when you're using dark frames which weren't taken at the same temperature/after exposing your light frames. I consider DSLR dark frame libraries to be an astrophotographic sin. The consistency is not there, unlike a dedicated cooled CCD. And, even then, people flush their libraries once a month, or once every couple of months.

H
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