Sat 15-Dec-12 01:24 AM | edited Sat 15-Dec-12 01:25 AM by tcerul
Same exposure settings as used for star trail shots should be used for the dark frame. If you used 30 second exposures then 30 seconds for the dark frame. And yes, just take another picture with the lens cap on and insert that photo into the dark frame area in the program.
Tom From Beautiful Smith Mountain Lake in Virginia