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I agreeImaging telescopes or lenses:TS Optics APO130f6, CELESTRON EdgeHD 8
Imaging cameras:QHYCCD QHY8L, ZWO ASI1600MM-Cool
Mounts:Ioptron CEM 120 EC2, Sky-Watcher NEQ-6 PRO GoTo SkyScan
Guiding telescopes or lenses:TS Optics APO130f6, CELESTRON EdgeHD 8
Guiding camera:Starlight Express Lodestar X2 Autoguider
Focal reducer:TS-Optics TSFlat 2
Software:Sequence Generator Pro, PixInsight , PHD Guiding 2.5.0
Filters:AstroDon 5nm Ha filter, ZWO new L
Accessories:ZWO EFW 31mm 8 positions, Starlight Xpress AO Unit, QHYCCD PoleMaster, Innovations Foresight ONAG, USB_Focus V3 Usb Focus, USB Stepper Motor Heavy Load
Resolution: 2906x1994
Dates:May 9, 2015, April 30, 2019, May 4, 2019, May 29, 2019
Frames:
71x600"
AstroDon 5nm Ha filter: 4x600" (gain: 139.00) -21C bin 1x1
AstroDon 5nm Ha filter: 7x600" -18C bin 1x1
ZWO new L: 15x120" (gain: 139.00) -21C bin 1x1
ZWO new L: 36x120" -18C bin 1x1
Integration: 15.4 hours
Avg. Moon age: 24.80 days
Avg. Moon phase: 28.61%
Astrometry.net job: 2745125
RA center: 14h 3' 14"
DEC center: +54° 20' 45"
Pixel scale: 0.759 arcsec/pixel
Orientation: 262.072 degrees
Field radius: 0.371
Locations: Duc, Prayssas, Lot et Garonne, France
Data source: Backyard
I have taken some Lum and Ha exposure with my APO and ASI1600mm set-up and combine them to 2015 single shot color exposure from 2105 (71x600" -15C bin 1x1 ).
The process was as follows in PI:
- I took the 2015 linear image (after integration and DBE)
- I Extract the CIE L*a*b channels
- I performed the usual preprocessing for the 2019 data to produce integrated linear image in L and Ha channels
- I did a weigheted integration of the L channel from 2015 data and Lum channel from the 2019 data using integration in PI
- I recombined channels in a collor image
- when NL for both the color image and the Ha image
- I slip the color image in RGB channels
- I add (with some weighting) the R and Ha channels
- I recombined the resulting RGB channels
- Green removal using SCNR
- Color Saturation with mask to protect background
- TGV noise removal
- Local Histogram Equalization
Final adjustement on iMac Photos
The 2 other versions are :
- D : did a masked strech instead of a pure Histo Transform
- E : using the full field of 2019 image, but not all the image is colored
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