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I agreeImaging telescope or lens:Canon 200 mm f/2.8 L II USM
Imaging camera:ZWO ASI1600MM-Cool
Mount:Orion Atlas EQ-G
Guiding telescope or lens:Orion 50mm Guide Scope with helical focusing
Guiding camera:QHYCCD 5L-II M
Software:Main Sequence Software Sequence Generator Pro , PHD2 Guiding, Pixinsight 1.8, Photoshop CS6, Cartes du Ciel
Filters:Astrodon Tru-Balance 1.25" 3nm OIII, Astrodon Tru-Balance 1.25" 5nm Ha
Accessory:Shoestring Astronomy EQDIR
Resolution: 5500x4542
Dates:Aug. 16, 2017, Aug. 18, 2017, Aug. 24, 2017, Aug. 27, 2017
Frames:
Astrodon Tru-Balance 1.25" 3nm OIII: 40x600" (gain: 200.00) -15C bin 1x1
Astrodon Tru-Balance 1.25" 5nm Ha: 35x300" (gain: 139.00) -15C bin 1x1
Integration: 9.6 hours
Darks: ~50
Flats: ~40
Bias: ~100
Avg. Moon age: 14.55 days
Avg. Moon phase: 22.34%
Bortle Dark-Sky Scale: 2.20
Mean SQM: 20.79
Astrometry.net job: 2105631
RA center: 317.661 degrees
DEC center: 60.095 degrees
Pixel scale: 2.700 arcsec/pixel
Orientation: 10.377 degrees
Field radius: 2.675 degrees
Data source: Traveller
The most fun and the most frustrating astro-image I've made so far! This is my fourth attempt at narrowband imaging. My first 3 subjects were: Jellyfish, N. America, and Crescent. This one was a LOT harder! Many false starts and missteps both in acquisition and processing. I threw out HOURS of data that wasn’t up to par, and this is my 4th full revision of the processing. I am still not fully happy with it, but each revision had positives and negatives, and I think this is the best balance of those so far. The most fun thing about the making of this image was the data (that I kept) was all captured on my road trip to see the eclipse, so all the data was from fairly dark to very dark sites. It is **very** faint. I used a tone mapping process originally described by J-P Metsavainio, which is why the stars are completely white. Basically all the color data is in the tone maps (which are starless). I then recombined that with the a synthetic Lum made out of Ha and Oiii data combined to bring back in the detail and stars.
Slight changes to colors that I think I like better.
More color tweaks... better? I think I've realized I am never going to get it looking exactly how I want without RGB data- I might try to gather some later this summer.
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