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Hi Ray,
Mine's an STF8300M and with the shortest I have which is a 3 min dark, below is what I got from ccdstack
background 928.78
maximum 1,053
and maxim
Minimum 730.000
Average 978.707
I do have bias frames and this is what I get
background 858.30
maximum 921
you've mentioned
SBIG quote 9.3 e read noise and 0.37 gain for their STF8300
ADU = Bias + 10*RN*RN/camera_gain
ADU = 970 + 865/0.37
which is 3307
Is this what I should aim for?
here are some values from my previous images
10min Ha - 1300
20min Ha - 1700
8min L - 4050
2sec to 60sec L - 1500 to 2000
Do we aim at a relatively empty patch for the measurements?
above was from different nights.
I might run a sequence and plot it to see the trend for the stf and my skies.
thanks
Alistair
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