Re-processed Image: SH2-124
Posted: Sat Apr 01, 2023 12:58 pm
This is a reprocess of an image that I did back in September. Sh2-124 is in northern Cygnus.
I recently saw a version of this nebula taken through a Hyperstar C-14 atf/ 2, 700mm focal length. That image was of a wider field than mine, and it showed a vast sea of background nebulosity. Even allowing for his faster focal ratio, I had enough data that I should have been able to achieve the same level of detail. My first attempt hadn't done it justice. So it was time for a reprocess.
I think I was afraid of the background the first time around because it was noisy, especially in the O3 channel. It is a really dim nebula. This time, I masked carefully and tweaked the noise reduction through the mask. That reduced it to the point where I could bring up the brightness and show off the background. I also dialed the stars down a couple of notches.
Orion 200mmf/ 4 Newtonian
Atik 383L+
24x 600sHa , 1x1 (04:00:00)
23x 900s O3, 1x1 (05:45:00)
10x 120s Red, 2x2 (00:20:00)
10x 120s Green, 2x2 (00:20:00)
10x 120s Blue, 2x2 (00:20:00)
Total exposure: 10:45:00
For comparison, here is the previous version (same data):
I recently saw a version of this nebula taken through a Hyperstar C-14 at
I think I was afraid of the background the first time around because it was noisy, especially in the O3 channel. It is a really dim nebula. This time, I masked carefully and tweaked the noise reduction through the mask. That reduced it to the point where I could bring up the brightness and show off the background. I also dialed the stars down a couple of notches.
Orion 200mm
Atik 383L+
24x 600s
23x 900s O3, 1x1 (05:45:00)
10x 120s Red, 2x2 (00:20:00)
10x 120s Green, 2x2 (00:20:00)
10x 120s Blue, 2x2 (00:20:00)
Total exposure: 10:45:00
For comparison, here is the previous version (same data):