Now we proceed to the creation of the master bias, master dark and master flat.
We need to stop and think about our calirbation routine now.
I want to calibrate the flats with the master bias, to properly remove the bias pedestal of the 6D camera of Vincent.
But I don’t want to calibrate the darks with the master bias. If I remove the bias from the darks, I’ll inject a bit of noise in the masterdark from the bias subtraction. Which will translate to slightly higher noise possibly in your calibrated lights. So I’ll choose to only calibrate the lights with a masterdark of darks which aren’t bias subtracted. The reason being: the bias is already in the darks ;-)
So first step is to make the master bias, we deselect the darks, flats, and lights and select the bias frames.
We set the master bias creation setttins at
2) CALIBRATE
Master bias
since I only work on 5 frames, i’ll do median combination without outlier rejection.
If you have plenty of bias, like 200-400 frames (which you should have to make a good master bias) select average and outlier rejection with 1 iteration with a kappa of 3.
Click on create calibration masters, the master bias will be created now. In the FITS header we can see statistics of the master bias. A bias and dark (or their masters can be viewed with DDP on now).
You’ll see that APP analysis the master bias on the CFA channels and pixels seperately ;-)
