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Hi all, wondering if you could help me identify and recommend a process for dealing with this? I got some good solar data yesterday and haven't seen this before. So far, this is just stacked in AutoStakkert 4 -->TIF. Is this something a dark frame would remove?? (haven't ever had to try that with this setup) optical train is (foa-60-->UV/IR cut-->Quark Chromosphere-->asi432mm)  |
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| Dark banding or just banding is definitely something that can be addressed by bias/dark removal but you mast have had a rather high gain to be that evident in the stacked frame which is rather unusual as typically the subject's movements within the frame lead to the banding to cancel out. |
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was using sharpcap, settings below. admittedly, was experimenting with different methods. Is there anything radically different about capturing darks for SER outputs? I assume this is better done via sharpcap? [ZWO ASI432MM] CameraSerialNumber=203252092A010900, via USB3 FrameType=Light Pan=0 Tilt=0 Output Format=SER file (*.ser)(Auto) Binning=1 Capture Area=1608x1104 Colour Space=MONO16 Exposure/Gain Shift=0 Temperature=40.4 Turbo USB=100 Flip=None Frame Rate Limit=Maximum Gain=192 Exposure=1.5010ms Timestamp Frames=Off Brightness=1 Auto Exp Max Gain=175 Auto Exp Max Exp MS=30000 Auto Exp Target Brightness=100 CA Reduction/Synthetic Blue=Off Mask over exposed pixels=Off Flip (after dark/flat)=None Trail Width=3 Minimum Trail Length=100 Trail Detection Sensitivity=9 Remove Satellite Trails=Off Background Subtraction=Off Planet/Disk Stabilization=Off Banding Threshold=20.02111189303308 Banding Suppression=19 Apply Flat=None Hot Pixel Sensitivity=5 Subtract Dark=None DisplayStretchEnable=1 NegativeDisplay=0 Display Black Point=0 Display MidTone Point=0.5 Display White Point=1 Notes= ZWO Focuser (2)=40405 Focuser Temperature=30.100000381469727 iOptron CEM120,70,40,26, GEM, HEM, HAE, HAZ series and SkyHunter Mount=RA=02:32:29.9,Dec=+13:14:05 (JNOW) TimeStamp=2024-04-28T17:20:27.8515702Z SharpCapVersion=4.1.11824.0 StartCapture=2024-04-28T17:20:27.7927726Z MidCapture=2024-04-28T17:21:17.9505275Z EndCapture=2024-04-28T17:22:08.1082825Z JDStartCapture=2460429.222544 JDMidCapture=2460429.223124 JDEndCapture=2460429.223705 Duration=100.316s FrameCount=2000 ActualFrameRate=19.9371fps TimeZone=-7.00 |
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| Just the same way you would for any other subject as long the same exposure and gain settings are kept and possibly same temperature (not really relevant for bias/very short integrations). Just add the integrated master bias/dark as fits in AS, |
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I did some review and am now suspicious of the banding supression in Sharpcap as the culprit. It's the only major difference between this SER and prior ones. I left this on for this SER (not purposely, which explains the lower frame rate now) any thoughts? can this banding supression go awry like this? |
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| Look at the bias. If you see banding then maybe there results are expected but ONLY if somehow solar tracking was really spot on, which I doubt is likely to be. In many many years of planetary imaging I never seen such egregious banding but OTOH I never used banding suppression (and I never would) and my main capture program is FireCapture at any rate. |
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andrea tasselli: I did finally try out their feature tracking. But I can't imagine it was that good. (seemed awfully chaotic at the time) i've never had banding suppression on before. Will be trying again in about 30 minutes and test it out. |
