Quote:
Originally Posted by Karlz
Thanks Martin,
I don't use unity gain or high dynamic range as I've found them not to produce enough signal. I did have a interesting read which wasn't taken to, it describes how best to use gain and offset to get the best from your camera. I've tried 180, 210, 300, 420 and 600 sec and there is a big difference between 180 to 300 to 600 in signal coming through, like you said to me push the camera which I do and I push the filter too.
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Karl,
When you mention more signal with longer subs do you mean more brightness in the sub and higher peak on the histogram more to the right ?? , if so then just remember that addition signal has also additional read noise, shot noise and dark current too which you have try to reduce through dithering, darks , stacking and processing etc...
There is a trade off between signal and noise floor and each camera performs differently
In my case I’ve found pushing beyond 300sec subs on my 2600MC reduces fine detail in my objects compared to 180 sec and 240 sec
I tried it with M83 a week ago and the image with 180 sec subs , although not as bright, definitely had more fine detail in the core and spiral arms ( both 300sec and 180sec were stacked and processed the same way , same integration time )
As I mentioned every camera and image train is different, plus conditions can change from night to night week to week
Keep posting your excellent images !!
Cheers
Martin