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 30 mins (20 x 90s)
Date: 5th 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. The background had high colour noise in red
and blue, so it was selected in Photoshop, and colour saturation reduced.
I am experimenting with imaging at ISO 800
with shorter individual exposures - rather than ISO 400 and 3 mins before.
Looks satisfactory and I have reduced the no. of frames discarded due to
trailing, but it's too early to tell if image quality is any different.