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Imaging telescope or lens:William Optics GT-81
Imaging camera:ZWO ASI1600MM-Cool
Mount:Orion Sirius EQ-G (HEQ5)
Guiding telescope or lens:Orion 50 mm Guide Scope
Guiding camera:Orion Star Shoot Auto Guider
Focal reducer:William Optics Flat 6A
Dates:Feb. 4, 2018
Integration: 58.3 hours
Avg. Moon age: 19.07 days
Avg. Moon phase: 80.43%
Bortle Dark-Sky Scale: 7.00
Astrometry.net job: 3443706
RA center: 6h 19' 22"
DEC center: +22° 50' 27"
Pixel scale: 4.045 arcsec/pixel
Orientation: 0.439 degrees
Field radius: 1.557 degrees
Locations: Backyard, Flower Mound, Texas, United States
Data source: Unknown
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool
Location: Flower Mound, TX (Bortle 7)
Dates: 12/9/17, 12/10/17, 12/11/17, 12/13/17, 12/20/17, 1/12/18, 1/13/18, 1/14/18, 1/16/18, 1/30/18, 1/31/18, 2/4/18
Gain: 200 Offset: 50
Camera temp: -20C
SII: 179x300" Astrodon 3nm
Ha: 283x300" Astrodon 5nm
OIII: 119x600" Astrodon 3nm
Total integration time: 58hr 20min
64x darks per calibration (master from library)
32x flats per calibration
200x bias per calibration (master from library)
Processing steps for original revision:
Batch PreProcessing script to generate calibrated images
LocalNormalization (except OIII)
ImageIntegration (Linear Fit rejection)
LinearFit to SII
Duplicated all three masters. One set used for tonemap creation, and one set used for a synthetic Lum.
Preparing masters for the tonemap (all processes applied to each master individually):
TGV and MMT noise reduction (via Jon Rista's method)
Histogram Transformation x2 (linear -> non-linear)
Created a starmask and removed stars via MMT and MorphologicalTransformation
Further eliminated stars by bringing into Photoshop and using "Dust & Scratches"
SHO masters assigned to RGB channels respectively to create a color image
About 5 different curves adjustments (a and b channels) using ColorMask Script to target individual colors and adjust them to an aesthetically pleasing composition
Created a synthetic luminance with PixelMath using the following formula: Ha*0.7 + Oiii*0.2 + Sii*0.1
HistogramTransformation x2 (linear -> non-linear)
ExponentialTransformation to push nebulosity
MMT for slight sharpening
Combined the Luminance with the Tonemap using LRGBCombination
CurvesTransformation for slight contrast
MorphologicalTransformation for slight star size reduction
ACDNR for slight noise reduction
CurvesTransformation for slight saturation
Resampled to 50% for web posting
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