Jon Rista:
Are these calibrated or uncalibrated frames? They look uncalibrated to me. This is the key reason WHY we calibrate our frames. In this case, I think its dark signal and DFPN (i.e. the pink bubble at the bottom looks like amp glow to me.) I would craft a quality master dark (say 16 or 25 dark frames), subtract that from each light, and see if things improve. I would use a good quality image calibration process, such as PixInsights, which allows you to add a pedestal, which is likely going to be necessary to avoid clipping signal to black with dark calibration...otherwise you'll really just be trading one problem for another.
Anyway, looks like some fairly rogue dark signal/DFPN issues to me, that should mostly be corrected with dark calibration.
Abdul Thomas Jnr:Jon Rista:
Are these calibrated or uncalibrated frames? They look uncalibrated to me. This is the key reason WHY we calibrate our frames. In this case, I think its dark signal and DFPN (i.e. the pink bubble at the bottom looks like amp glow to me.) I would craft a quality master dark (say 16 or 25 dark frames), subtract that from each light, and see if things improve. I would use a good quality image calibration process, such as PixInsights, which allows you to add a pedestal, which is likely going to be necessary to avoid clipping signal to black with dark calibration...otherwise you'll really just be trading one problem for another.
Anyway, looks like some fairly rogue dark signal/DFPN issues to me, that should mostly be corrected with dark calibration.
*** These are uncalibrated subs but I have stacked the files with darks and applied both dbe and gradient correction and still the banding is there. I need to take new sets of flats tonight and see if that solves the problem***
Jon Rista:
Also curious, what is your cooling setpoint? The 183MC Pro is cooled, right?
Jon Rista:Abdul Thomas Jnr:Jon Rista:
Are these calibrated or uncalibrated frames? They look uncalibrated to me. This is the key reason WHY we calibrate our frames. In this case, I think its dark signal and DFPN (i.e. the pink bubble at the bottom looks like amp glow to me.) I would craft a quality master dark (say 16 or 25 dark frames), subtract that from each light, and see if things improve. I would use a good quality image calibration process, such as PixInsights, which allows you to add a pedestal, which is likely going to be necessary to avoid clipping signal to black with dark calibration...otherwise you'll really just be trading one problem for another.
Anyway, looks like some fairly rogue dark signal/DFPN issues to me, that should mostly be corrected with dark calibration.
*** These are uncalibrated subs but I have stacked the files with darks and applied both dbe and gradient correction and still the banding is there. I need to take new sets of flats tonight and see if that solves the problem***
Could you share an example with proper dark calibration? While some of the signal in the field does appear to be something that flats would correct, I don't believe the banding would be. Dark calibration should have corrected a LOT of the junk in the field here. It would be useful to see how dark calibration affects the results.