Still not satisfied with my Nautilus Galaxy image, and with another nice, relatively Moonless night, I decided to try again, this time with a UHC-S filter (since that seemed to helpe with IC 342 last night) and 600 s subframes. Guiding conditions were not perfect but were still pretty good. Did all my finding with Astrotortilla+Picgoto, both originally and after a meridian flip. It worked great. The resulting image is definitely the best so far, but I still wonder if I couldn't do better. I tried combining my 480 s subs from a few nights back, but don't think that looks as good as this.
Date: 29 Oct 2014
Subject: NGC 772, Nautilus Galaxy
Scope: AT8IN
Filter: Baader UHC-S
Mount: CG-5 (Synta motors, PicGoto Simplificado)
Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.3.1k (Win 7 ASCOM)
Camera: DSI IIc chiller at 2.50 A, 3-7 °C
Acquisition: Nebulosity 3.2.1, no dither
Exposure: 38x600 s
Stacking: Neb 3, bad pixel map, bias included+flats, normalize, trans+rot align, 1.5 SD stack.
Processing: StarTools 1.3.5.289 Crop; Wipe:Color & brightness 75%; Develop 90.05%; HDR
ptimize; Color:Scientific, 265%, cap green to yellow; Deconvolute 2.3 pix; Life:Moderate; Life:Less=more; HDR
ptimize; Track Grain size 10.2 pix, Smoothness 81%; Magic:Shrink 1 pix; Rotate 180°; Repair:Warp. Photoshop CC 2014 + Carboni Astronomy Tools Deep space noise reduction; Levels (darken); Layer mask; Astro Frame.
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