Telescope: Orion 80ED apochromatic
refractor at f/7.5
Focus: Prime focus
Filter: Astronomik Hydrogen Alpha
Mount: Vixen GPD with Skysensor2000
Camera: Artemis 285 CCD camera
Guiding: 700mm refractor guidescope,
SAC7 camera, autoguided with Guidedog software
Exposure: Total 105 mins (15 x 420s)
Date: 4th Feb 2006
Processing: Offset and flat
fielding, registering and stacking done in IRIS. No dark frames.
Curve stretching, Levels, Smart Sharpen in Photoshop CS2.
With stiffening of my guidescope
mountings, and tweaking of Guidedog settings, I managed to get the guiding
error on this image down to within 2 arcsec, ie a single pixel. The
result is a wealth of detail and depth. Good transparency, excellent
seeing and no wind.