Imaging telescope or lens: Astro-Tech AT8IN
Imaging camera: Meade DSI II C
Mount: Skywatcher NEQ-6 Pro Synscan
Guiding telescope or lens: Orion ShortTube 80 f/5
Guiding camera: Meade DSI
Filter: Baader Planetarium UHC-S Filter
Dates: May 26, 2016
Integration: 3.7 hours
Avg. Moon age: 18.62 days
Avg. Moon phase: 84.07%
Astrometry.net job: 1094895
RA center: 194.166 degrees
DEC center: 21.694 degrees
Pixel scale: 1.869 arcsec/pixel
Orientation: 2.776 degrees
Field radius: 0.252 degrees
Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States
I've tried a couple of times this season to get this image. The first time, using 600 s subframes, wasn't good enough to post. I decided I had used the wrong filter (a UHC-S nebula filter) for this galaxy. But the other night I tried again, and forgot and used the UHC-S filter again. This time I used 300 s subframes. I processed two images stacked using Deep Sky Stacker, with and without 2x drizzle, and was not happy with either. Both looked quite noisy even in the core, and there was especially a lot of grainy color noise. I thought the filter had messed things up again, but then I processed the Nebulosity-stacked version and it looked much better, so I'm going with that version. (This is a little unusual, in that the DSS-stacked version is usually about as good as if not better than the Nebulosity-stacked version--I routinely stack both ways.) I used somewhat different processing on this image than usual: HDR equalize rather than optimize, and less color saturation. I’m still tempted to try again without the filter, however.
Revision: darkened the background with levels and a layer mask
Date: 25-26 May 2016
Subject: M64, Black Eye Galaxy
Scope: AT8IN+High Point Scientific Coma Corrector
Filter: Baader Planetarium UHC-S
Mount: EQ-6 (EQMOD)+PEC
Guiding: Orion ST-80 + Antares 0.5x focal reducer + DSI Ic + PHD 220.127.116.11 (Win 7 ASCOM)
Camera: DSI IIc, no chiller CCD 11 °C
Acquisition: Sequence Generator Pro 18.104.22.168 with Nebulosity 4.0.4 ASCOM camera driver
Exposure: 44x300 s
Stacking: Neb 4, bad pixel map, bias included, 33 flats, match histograms, trans+rot align, Neb 4 40-60%tile stack.
Processing: StarTools 1.4.316: Crop; Wipe; Develop: 87.97%; HDR:Equalize; Color:Scientific, 150% saturation, red bias reduce 1.35; Deconvolute: 2.2 pix; Track: Smoothness 87%, 4.5 pix; Magic, shrink 1 pix. Photoshop CS6 + Astronomy Tools: Deep space noise reduction (2x); lncrease star color; Astroframe.
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