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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

 

large.M81240420_1Small.jpg.e85d3e66f707666b80a0cb485d8b962a.jpg

 

large.M81240420_2Small.jpg.eced6c8a661470cd4a54fe5b8358fa2b.jpg

 

large.M81240420_3Small.jpg.91f052f8edfe5ed752c3ee819251a98e.jpg

 

Thanks

Edited by RonC
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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 ga

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?

first one look best, amp glow is a pain but you could crop it out for smaller targets

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.

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