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M57 Ring Nebula
LX90GPS 8" f/10 DSI-C Alt-Az
57 x 30 sec subs (29 min)
Wind Gusts made alignment difficult for Envisage 4. 57/101 subs used.
3 ~20-frame stacks aligned by eyeball and stacked in PS CS2
Capture: Envisage 10/6/07
Processing: Fits Liberator/16 bit; PS CS2 Levels, Threshold, Curves,
Smart Sharpen, High Pass on DSO (9.0), Noel's "Deep Space Noise Reduction"
small curve adjustments to align left edge of histos.
(Reprocessed 10/28/07 to avoid small clipping of original, but still has red-blue fringing due to imperfect eyeball alignment)
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