Calibrating flats... yet again...

[UlteriorModem]

I know this has been discussed already and I have found lots of info. Perhaps too much info.

I have a set of flats taken with an OSC (ASI1500mc) that I went to use image calibration process on.

The flat frames were a duration of right around 1 second. The shortest duration mast flat I have is 120 seconds.

When I go to execute the calibration a lot of "No correlation of dark frame" comes up. Now I sort of understand why this error comes up, and I tried a few suggestions on how to avoid it, principally the .fits image parameters. Tried with and without calibration checked and still get the error message.

So would it be best to just omit the master dark and calibrate to the bias only? Do I need darks with the same duration as the flats?

Thanks for your patience.

[bulrichl]

Indeed your questions have been answered in this thread: https://pixinsight.com/forum/index.php?topic=14129.0 . Again:

Skip the bias frames, they are not needed for a ASI1600. Capture light frames, dark frames (same gain, offset, exposure time as the light frames), flat frames, and flat-darks (same gain, offset, exposure time as the flat frames).

Integrate the dark frames to the MasterDark.

Integrate the flat-darks to the MasterFlat-Dark. Calibrate each flat frame with the MasterFlat-Dark. Integrate the calibrated flat frames to the MasterFlat.

Calibrate each light frame with MasterDark (no 'Calibrate', no 'Optimize') and MasterFlat (no 'Calibrate').

Debayer the calibrated light frames.

Register the debayered, calibrated light frames.

Integrate the registered, debayered, calibrated light frames.

Bernd

[UlteriorModem]

Thanks.

So the short answer is I need flat darks.