Help With Flats

Tony Benjamin

Hi Adam,

I carefully followed your suggestions for setting up PI to produce my flats. I'm using an FLI ML16200 camera and used a flat panel to create the Lum_Flats (using 1.33 seconds and 30,000 ADU).

I went and calibrated my M13 light subs with only the Lum Master Flat I produced from the above settings (no Bias or Dark masters) - just wanted to see if the Flat would remove the dust motes. The Integrated image I got was one that is seriously over corrected. Do you know what would cause that?

Wade Hilmo

That's expected behavior.

In order for the math to be correct, both the master flat and the target image must be properly bias and/or dark calibrated.  If everything is not calibrated correctly, you can get over or under correction, depending on what steps were skipped.