+RonC Posted April 25, 2020 Share Posted April 25, 2020 (edited) Well last night I decided to test out the cam having done a sensor analysis earlier in the day. Ideal exposure was 72s but with an LP filter fitted I chose a 90s exposures. My target was Bodes galaxy.(M81/82) I started with Unity gain at 398 and did 10 exposures, then a gain of 500 and then 600 and then half way through 700 it clouded over so I scrapped those. More tests to follow. The Unity gain looks the best to me with little noise and no amp glow, 500 gain also seems OK but 600 showed some noise and amp glow (as did the 5 x 700 exposures.) Images below are in order, gains of 398,500 and 600 and all have the same number of Dark's, Flats and Bias's added and put through PS for an equal stretch. Comments please? Ron Thanks Edited April 25, 2020 by RonC added text +seven_legs, +Glafnazur and BAZ 3 Link to comment Share on other sites More sharing options...
+Graham Posted April 25, 2020 Share Posted April 25, 2020 First one looks the best as far as noise but it may be different at full size. Did you use the same cali frames for all of them. I ask because the flat frame should have removed the amp glow but it hasn't. Link to comment Share on other sites More sharing options...
+RonC Posted April 25, 2020 Author Share Posted April 25, 2020 Yes Graham, same cali frames on all... Link to comment Share on other sites More sharing options...
Clive Posted April 25, 2020 Share Posted April 25, 2020 The amp glow is certainly brighter on the higher gain image but is that because the darks gain doesn't match the the lights gain? +Ibbo 1 Link to comment Share on other sites More sharing options...
+Ibbo Posted April 25, 2020 Share Posted April 25, 2020 As Clive said darks should match lights time. Link to comment Share on other sites More sharing options...
+RonC Posted April 25, 2020 Author Share Posted April 25, 2020 Agreed but there's only so much time!!!! (and darkness) 😏 Link to comment Share on other sites More sharing options...
red dwalf Posted April 25, 2020 Share Posted April 25, 2020 first one look best, amp glow is a pain but you could crop it out for smaller targets +RonC 1 Link to comment Share on other sites More sharing options...
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