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Old 02-01-2015, 11:19 AM
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Amaranthus (Barry)
Thylacinus stargazoculus

Amaranthus is offline
 
Join Date: Jan 2014
Location: Judbury, Tasmania
Posts: 1,203
Michael, looking at your image stats, you can see that the min ADU is 5,879. This is an unreliable figure for your background, however, because it might reflect a relatively insensitive pixel. However, it will be closer to the background than the mean figure of 15,050. I'd say your background is probably around 6000, but hunt around the image and check that out. This suggests that an exposure for L in the range of 4-6 min might be suitable.

Do you image at a dark-sky location? I know Cessnock is in a rural area, so if you're away from the town a bit, then your sky background could be quite low, except in the direction of the Newcastle light dome.
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