Imaging telescope or lens: Astro-Tech AT8IN
Imaging camera: ZWO ASI1600MM-Cool
Mount: Skywatcher NEQ-6 Pro Synscan
Guiding telescope or lens: Astro-Tech AT8IN
Guiding camera: Meade DSI II C
Dates: April 14, 2017
Integration: 4.7 hours
Avg. Moon age: 17.28 days
Avg. Moon phase: 93.00%
Astrometry.net job: 1539805
RA center: 169.981 degrees
DEC center: 13.322 degrees
Pixel scale: 0.858 arcsec/pixel
Orientation: -89.634 degrees
Field radius: 0.664 degrees
Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States
Still a little more Moon than is good for this kind of image, but this was my last chance to image for a while and the weather was cooperating. Had some trouble finding good guide stars, and my guiding is the next area that needs a lot of work. I kept trying to set things up to get the maximum number of subs before this target set, but apparently I guessed wrong and I only got half as many R subs as I was shooting for before Leo disappeared behind the neighbor's trees. So I had to make do with what I've got. Perhaps as a result, it turned out to be difficult to bring out much color in this image. Still, it's a lot better than my last previous look at the Leo Trio.
Date: 14 Apr 2017
Subject: M65, M66, NGC 3628, The Leo Trio
Scope: AT8IN + High Point Scientific coma corrector
Filters: ZWO 31 mm diameter unmounted L, R, G, B
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + DSI +PHD 220.127.116.11 (Win 10 ASCOM) using predictive PEC algorithm
Camera: ASI1600MM-Cool, -20 °C, Gain 0 Offset 10
Acquisition: Sequence Generator Pro 18.104.22.168
Exposure: 52x180 L, 8x180 R, 17x180 G, 17x180 B
Stacking: Neb 4.1.5, flats & darks, trans+rot align, Nebulosity 1.5σ stack and align.
Processing: StarTools 1.4.327. Aggressively stretched and deconvoluted the luminance. Combined RGB in Neb 4 and stretched, color balanced, and sharpened in StarTools. Used StarTools' "Repair" module to "repair" some stars that were out of round due to optical problems, but some of the "repaired" stars were probably really faint fuzzies that should not have been messed with. Layered luminance over RGB in Photoshop CC 2014, used Carboni’s Astronomy Tools deep space noise reduction several times, boosted the vibrance a lot and saturation almost as much (masking out some in the core of M66), topped off with AstroFrame.
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