I've had my camera for a few months now, I've noticed that about the longest exposure I can get away with is 300s with successful image calibration, i.e no leftover amp glow. Attached is a 600s ha exposure. This is my first Sony chip camera, is this due to the design of the Sony chip? I never had this issue with my Kaf chip cameras.
Mike, to tell if it is amp glow, dark frames will show it. Would you mind posting a couple of comparable dark frames?
Yes please post 300s and 600s dark frames. I'll note that your 600s is Ha, whereas the 300s is Luminance. The L will have much higher background illumination.
Yes there is a small amount of amp glow there. However, when I subtract your dark from your light it is completely removed.
I concur with Doug. The Sony chip layout is different from the Kodak-derived sensors. The Sony chips exhibit a small amount of amp glow in some of the corners and at the top.
Including the 600s sub Doug? If so for some reason image calibration that I use in Pixinsight isn't doing the job.
Hi Mike. With PI the calibration option "Optimise" should not be used if the dark frame has amp glow as the glow creates a false noise evaluation and the calibrated frame will be under-compensated. This is the case for most CMOS sensors and a few CCD's that show amp-glow.
I figured this out trial and error this afternoon William. I was able to calibrate successfully using Maxim Dl first, so I knew it could be done. I do like the Kaf chip cameras as there is less work although the tradeoff is more noise.
