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 80 mins (20 x 240s)
Date: 1st May 2005
Processing: RAW file conversion,
Offset and Dark subtraction, flat fielding, registering and stacking done in
IRIS. Only the Red channel was used. Curve stretching and a
little unsharp masking in Photoshop CS. Star ovality reduced through
making a duplicate layer and offsetting that by two pixels using the
'darken' blending mode in Photoshop. Noise reduction in Neat Image.
It was a hot, humid (29 deg C, 90%) and
windless night. Transparency was middling to poor. Stayed up
till 5 am for this!