Telescope: Celestron 9.25"
Schimdt-Cassegrain at f/6.3
Focus: Prime focus
Filter: Celestron LPR filter
Mount: Vixen GPD with Skysensor2000
Camera: Modified Canon EOS 300D, at
Guiding: 700mm refractor guidescope,
SAC7 camera, autoguided with Guidedog software
Exposure: Total 52 mins (35 x 90s)
Date: 5th March 2005
Processing: RAW file conversion,
Offset and Dark subtraction, flat fielding, registering and stacking done in
IRIS. Curve stretching in Photoshop CS, noise reduction in Neat Image.
The strategy of taking shorter, but more
frames at ISO800 (rather than 400) seems to have paid off. Quite a
smooth image, especially in the outer dim parts of the galaxies.