Telescope: Celestron 9.25"
Schimdt-Cassegrain at f/6.3
Focus: Prime focus
Filter: Celestron LPR
Mount: Vixen GPD with Skysensor2000
Camera: Modified Canon EOS 300D, at
Guiding: 700mm refractor guidescope,
SAC7 camera, autoguided with Guidedog software
Exposure: Total 45 mins (15 x 180s)
Date: 10th February 2005
Processing: RAW file conversion,
Offset and Dark subtraction, flat fielding, registering and stacking done in
IRIS. Curve stretching and colour saturation enhancement by Luminance
Layering in Photoshop CS.
Processed using flats produced using a new
light box that I have built. Flat evenness is still not perfect - see
the darker corners in the highly contrast stretched negative image.
On the plus side, it's remarkable how
modern digital techniques can cut through light pollution. Even in the
mag 4 (at very best) skies of Singapore it is possible to detect mag 19
galaxies. Stars down to mag 19.6 (USNO B1.0) imaged.