Dark Flat Frames

Hi Tim, thank you for the nice compliment.

Yes, APP can certainly handle dark flats (I use it myself with both DLSR and ASI1600 😉 ). They should be treated as darks for your flats.

So just load the dark flats for your flat calibration as darks. Make sure you use the same exposure time as your flats. If your flats have different exposure times (some photographers have this with ACP capture for instance) then increase the exposure tolerance for the master dark. This is a percentage.

Let me know if this works for you.

Kind regards,

Mabula

Thanks Mabula, I finally got around to processing an image with dark flats. I loaded the dark flats with the flats during the calibration phase. The individual flat frames showed a D beside them indicating - I think - that  they were treated as darks for the flats. However, APP also produced a master Dark Flat as well as a master flat. So, does the master flat already have the dark flat data included or do I use both the master flat and the master dark flat for the next phase?

Hi Tim,

Yes, the D next to the flats indicate that a master dark flat is subtracted in the creation of the master flat. So the master flat has the master dark flat already subtracted.

So for calibration of the lights, the masterdarkflat is not to be used. Make sure the lights are calibrated with a masterdark (or masterbias) for the lights, the masterflat and possibly a BPM 😉

Kind regards,

Mabula