Quote:
Originally Posted by Stephane
Martin, again, thank you for the kind words. Many on this forum have helped me tremendously.
I live in the inner suburbs of Melbourne and believe I'm in a Bortle 6 zone.
Light pollution is a pain to deal with as the gradients always leave artefacts once removed, but I have had some interesting results when stacking 150ish subs at a time, removing light gradients, and then combining stacks. The artefacts from the stacks appear in different locations and tend to smoothen out when combined. Then, once combined, I do another light gradient removal. I got the idea here. I'm not sure if this is a recommended technique, but it seems to have worked well on this image. I might try it again on my next galaxy.
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Yes, light pollution is the bane of our existence in AP
Pushing those longish 3 min subs under that Bortle 6 Sky and no filter ( only the UV/ IR cut protective window) takes a lot of skill and patience in post processing.
Most folk limit broadband sub exposure lengths around 30sec to 90 sec under heavy light polluted skies ( Bortle 6 to 9) and still struggle to achieve good results with resolution and fine detail.
Your mammoth amount of data ( signal ) irrespective of heavy gradient, made all the difference with this wonderful image
Also your post processing techniques are working beautifully, keep going !!
I assume that your using Gain 100 on the 2600MC ( HCG mode , low read noise ) ?
Cheers
Martin