It is recommended to take dark and bias frames at least once per observing session. This ensures that any changes in the camera's performance or environmental conditions are accounted for.
No, you do not need to take dark and bias frames for every image. However, it is important to take them regularly to ensure accurate calibration of your images.
It is recommended to take at least 10-20 dark and bias frames for each filter used. The more frames you take, the better your calibration will be.
The exposure time for dark frames should match the exposure time used for your science images. For bias frames, a short exposure time of 1-2 seconds is sufficient.
Yes, dark and bias frames can be reused as long as the camera settings and environmental conditions remain the same. It is recommended to take new frames if there are any changes in these factors.