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Thanks Dave, Yes that is mostly the reason for the longer exposure. I have been doing this for a while with the blue being longer. At one point I was doing 20 minute subs in blue and 15 minutes in each of the green and red. I found I was loosing star colour at that length and dropped down to 10 and 5 minutes respectively. I am now thinging 15 and 10 are the go. When I have full automation going I will the software deal with the length of time.
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