|
Hi Greg,
I appreciate your feedback! Especially since you are using the same camera.
What I cannot understand, and perhaps I'm not grasping something basic, is why I'm unable to calibrate using only a master flat (I have 2 different masters one at 35K adu, the other at 20K adu). That is, without either a dark subtraction, or a bias subtraction (acting as a substitute dark) in the calibration tool. If I use a "dark" I get a good result with either flat. If I disable use dark in calibration I get a terrible result. I've tried both ways. 1. subtract bias when making the flat, 2. by subtracting the bias when running the calibration tool.
Should it be possible to calibrate using only a flat and get a good result?
I easily made a pix map from a dark frame. I've tried applying the map on the dark frame (as a test) and to raw and calibrated subs (calibrated by using the bias as a dark). The remove pix seems to work great. (I selected interpolate.)
Ideally I'd love to be able to just apply a flat (without using a dark or bias frame) and the pix map. I think it would give the best results in terms of s/n but so far this seems not possible.
Peter
|