Can anyone help me with these banding across my light subs? Will like to know what's causing it (maybe rise in temperature) as it's coming to Summer months now and also how I can get rid during processing? This is the second time it has happened now and the last time I had to throw away over 3 hours of imaging time though last night the banding wasn't as bad. Thanks in advance Rasa 8 and Zwo 183mc pro camera   |
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hi
double check your flats and flat light panel
CS, Brian
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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.
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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***
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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.
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Also curious, what is your cooling setpoint? The 183MC Pro is cooled, right?
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Jon Rista:
Also curious, what is your cooling setpoint? The 183MC Pro is cooled, right? *** Yes, cooling is on - 10 degrees ***
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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. *** I'm going to stack up again with new flats and dark flats and see if that solves it***
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8.64
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