Hi,
I have been astropicturing for a while now, usually narrowband since I am imaging from inner city. When doing broadband, it seems that flats are not behaving very nicely.
All frames are newly captured, all same temp, gain and offset:
I used WBPP2 to do calibration. Flats are taken with a flat panel (tracing pad from amazon).
For the master flat, wbpp picked LinearFit, equalize fluxes, and the median is at 25,361 (16bits). (tried with lower, ~15k as well..)
However, the result seems to be over-corrected: If you blink these images the vignetting seems to match:
Any clues?
I have been astropicturing for a while now, usually narrowband since I am imaging from inner city. When doing broadband, it seems that flats are not behaving very nicely.
All frames are newly captured, all same temp, gain and offset:
Code:
lights: 60 seconds, temp -10c, gain 76, offset 30, x120
darks: 60 seconds, temp -10c, gain 76, offset 30, x100
flats: 1 seconds, temp -10c, gain 76, offset 30, x20
darkflats: 1 seconds, temp -10c, gain 76, offset 30, x20
I used WBPP2 to do calibration. Flats are taken with a flat panel (tracing pad from amazon).
For the master flat, wbpp picked LinearFit, equalize fluxes, and the median is at 25,361 (16bits). (tried with lower, ~15k as well..)
However, the result seems to be over-corrected: If you blink these images the vignetting seems to match:
Any clues?
Last edited: