So, I'm switching from a DSLR workflow to a mono workflow. I have recently purchased a ZWO 183, and I'm finding the processing curve fairly steep. Obviously the major bummer with mono is taking three times as long, but I'm okay with that so long as the results are worth the extra time, but so far my results have been kind of disappointing. My first target with this camera was the Cygnus Loop, but I'm seeing quite a bit of noise in my 5 minute subs. Here are some examples.
This is a single 5 minute sub with 300 gain (camera default) and 10 black level set in APT. I stacked this single image with one dark sub to remove the amp glow.
This is zoomed in on the same image
This is a stacked image with 24 exposures 5 minute subs
This is the full stacked image with moderate stretching...
After some research I have noticed that 300 gain is probably not the best to use, and I'm assuming that the "black level" setting in APT in supposed to correspond with the offset...
Here are my questions:
1) Is this level of background noise expected?
2) After capturing 8 hours of data across 3 different narrowband filters at gain 300 offset 8, should I dump the data and re-shoot with a lower gain?
3) Is there a setting in DSS that I'm not using properly when stacking these images?
4) If I stack 50 subs instead of 25, will this reduce that noise in the slightest?
Here is what I'm using....
Explore Scientific 80mm Triplet
ZWO ASI183 MONO
Optolong Ha, SII, OIII Filters
Apertura 60mm Guide Scope
Orion Starshoot G3 DSO (re-purposed as guide camera)
Sky-Watcher EQ6-R Pro
PixInsight (Just started using it)
Sequator (Unfortunately doesn't seem to handle the .fit files that the 183 produces, so I haven't been using it since the switch)
I am NOT binning...
Edited by venyix, 21 September 2020 - 08:40 PM.