Telescope: Celestron 9.25"
Schmidt-Cassegrain at f/6.3
Focus: Prime focus
Filter: Astronomik Hydrogen Alpha
Mount: Vixen GPD with Skysensor2000
Camera: Modified Canon EOS 300D, at
Guiding: 700mm refractor guidescope,
SAC7 camera, autoguided with Guidedog software
Exposure: Total 72 mins (24 x 180s)
Date: 22nd July 2005
Processing: RAW file conversion,
Offset and Dark subtraction, flat fielding, registering and stacking done in
IRIS. Only the Red channel was used. IRIS pre-processing almost
all automated with AutoIt scripts. Curve stretching in Photoshop CS.
Background gradient removal in
PixInsight. Noise reduction in Neat Image.
I have added PixInsight to the set of
tools I use for image processing. In particular, DBE (Dynamic
Background Extraction) is a powerful means of removing unwanted vignetting
Acquisition was managed by GADFly, an AutoIt script I wrote to automatically
nudge the position of the guidestar every few exposures.
There was a full moon that night, but good