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Imaging telescope or lens:William Optics GT81-II
Imaging camera:ZWO AIS1600 MM pro
Mount:SkyWatcher EQ6-R Pro
Guiding telescope or lens:William Optics 50mm Guide Scope
Guiding camera:ZWO ASI1290MM Mini
Focal reducer:William Optics flat 6A III
Astrometry.net job: 3541672
RA center: 16h 38' 57"
DEC center: -48° 26' 31"
Pixel scale: 1.358 arcsec/pixel
Orientation: 305.720 degrees
Field radius: 1.219 degrees
Data source: Backyard
This is a 23.7 hour SHO image of NGC 6188 - a popular southern hemisphere target known as the Fighting Dragons of Ara. This nebula resides within the open cluster called NGC 6193, which is invisible to the naked eye and responsible for lighting up the contours of this amazing scene.
Scope: William Optics GT81-II F/5.9, DeepSkyDad Autofocuser
FF/Reducer: WO Flat6A-iii
Mount: EQ6-R PRO
Imaging camera: ZWO ASI1600MM with matching ZWO 36mm filters and 7 slot filter wheel
Guiding: WO 50mm guide scope with a ZWO 290mm guide camera
Pixel scale 2.04 arc/s
All frames at 139 gain 50 offset and cooled to -15c
151x180s OIII (7.55h)
151x180s SII (7.55h)
172x180s Ha (8.6h)
Total integration time: 23.7 hours
Location: Wellington, New Zealand - Bortle 4 skies.
Astro Pixel Processor
Individual frames calibrated, analysed, registered and normalised.
Stacked in APP on Auto with drizzle applied (droplet 0.75, scale 1.5).
Frames cropped to remove stacking artifacts at the borders.
ABE on each channel.
Jon Rista method of noise reduction (TGVD and MMT).
Ha was duplicated for use as luminance and then had deconvolution applied.
The luminance then had a starless copy created using StarNet and then had an s-curve, LHE and sharpening applied (potected with a starmask).
This was then combined with the non-starless image at 60%/40%.
SII, Ha and OIII frames taken non linear with ArcsinhStretch and HT and then channel combinted in SHO.
SHO (RGB combined channel):
CorrectMagentaStars script (inverts, SCNR, invert back).
SCNR @ 90%.
Small pass of ABE for lingering gradients.
Mulitple curves transformations inlcuding hue shift to turn a nasty dull mustard into more of a copper red.
Star reduction following David Ault's excellent tutorial http://trappedphotons.com/blog/?p=731
LRGB comnination with Luminance.
LRGB combined SHO:
RGB/k and saturation curves.
Dark structure enhance script.
Very conservative pass of DBE to remove a dominant blue gloss.
Further star reduction.
TVGDenoise to clear up the chromonance background structure.
Saved for further processing in Affinity Photo.
Adjsutments to levels, saturation, vibrance, contrast and selective colour.
Re-sampled for web.
Thanks for looking!
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