Calibration frames for ASI 1600MC

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Calibration frames for ASI 1600MC

Postby pwhit » Fri Feb 02, 2018 10:37 am

I'm trying to determine the optimum calibration workflow for deep-sky images using my ASI1600MC camera. I'm in a rural area so light pollution is reasonably low. I shoot my light frames at -20C and my subexposures tend to be 2 min or less. I use Pixinsight for pre and post-processing My questions are :
1) Is there any need for Dark Frame calibration as the camera has low thermal noise and I shoot with the cooler on at -20C ?
2) If Dark Frame calibration is not necessary can I ignore Bias correction also ?
3) Should I calibrate my Flat Frames (0.005 sec exposure using EL panel at -20C) ? Is there any point calibrating these with a dark frame exposed for 0.005 sec ?
4) Do I need to change how I calibrate depending on the Gain and Offset settings that i use ?
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Re: Calibration frames for ASI 1600MC

Postby SlamDunk » Mon Feb 05, 2018 8:08 am

1) Yes, use dark frames as it subtracts the amp glow from the lights
2) I don’t use bias frames, but tend to use a large number of dark frames
3) Don’t know
4) Use a master dark for each gain/offset/exposure length combination that you use. Uncheck “optimize” in ImageCalibration.
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Re: Calibration frames for ASI 1600MC

Postby Sean.Wang » Sat Feb 10, 2018 3:45 am

1) Is there any need for Dark Frame calibration as the camera has low thermal noise and I shoot with the cooler on at -20C ?
Yes, dark must have same parameters as light.
2) If Dark Frame calibration is not necessary can I ignore Bias correction also ?
Dark frame still useful if you don't take bias.
3) Should I calibrate my Flat Frames (0.005 sec exposure using EL panel at -20C) ? Is there any point calibrating these with a dark frame exposed for 0.005 sec ?
Yes, same temperature.
4) Do I need to change how I calibrate depending on the Gain and Offset settings that i use ?
Gain and offest must be same for calibrate frames, same as light.
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