[The_bluester (Paul)]

Regardless of if you meant it that way or not, having a crack at people is not going to help anyone.

The advice changes from camera to camera, but for the ASI294MC (And possibly the new ASI294MM) bias frames are not useful. They are used to subtract the repeatable read noise from other frames. The ASI294MC sensor is a SOC (System On a Chip) and for exposures below a certain threshold value (Which no one seems 100% sure on, somewhere less than 5 seconds apparently) the exposure timing is done on the sensor chip. Below that the external circuitry takes over. That means that the read noise for a bias frame (Taken at the shortest possible exposure) is different to the lights, darks, flats etc. Because of that bias frames are not useful with the ASI294 camera.


For flats I used a panel (before I had a panel I used a screen with a dim grey image on it) and an exposure time of 10 seconds with the camera cooled, and dark flats under the same conditions.


My ASI2600 is a different kettle of fish and bias frames work properly with it.