Hi Maurice,
APP has the following rules for applying master calibration frames to frames that need calibration:
First, for BIAS frames there are no rules, since they can’t be calbrated
Darks: can only by calibrated by a master bias of the same ISO or gain + offset (but usually gain + offset are not even in the fits header of the software that does the capture)
Flats:
1) can be calibrated by a master bias of the same iso (gain+offset)
2) can be calibrated by a master dark of the same iso (gain+offset) and the same exposure time
3) can be calibrated by a Bad Pixel Map
Lights:
1) can be calibrated by a master bias of the same iso (gain+offset)
2) can be calibrated by a master dark of the same iso (gain+offset) and the same exposure time
3) can be calibrated by a master flat ( no restriction on ISO or gain/offset )
4) can be calibrated by a Bad Pixel Map of the same instrument name (instument is fits convention for the used camera)
So your masterbias of iso200 for your flats and your masterbias of iso1600 for your lights will automatically be applied to the correct frames (that have the same ISO), since APP has the strict rule that master bias frames must match the iso of the frame that needs calibration.
Even better, you can visually check if calibration works like it should.
When you have created your master calibration files, load your lights and your master calibration files.
For each light there will be certain marks in the frame column in the bottom file list window, indicating this frame can be calibrated now with a certain master calibration frame.
B for Bias
D for Dark
F for Flat
BPM for BPM..
Now above the image viewer window, there is a dropdownbox, which is set at linear by default.
Click on one of your images in the filelist and it will be shown linearly.
And you can also display your frame, fully calibrated with the masters. Set the dropdownbox to
l-calibrated
and the image will be shown linearly and calibrated with the master frames that are supplied. So you can visually check if the master flat is of good quality and also if the BPM for instance actually removes bad pixels.
Let me know if this is clear ;-)