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I agreeImaging telescope or lens:TS Optics APO130f6
Imaging camera:ZWO ASI1600MM-Cool
Mount:Ioptron CEM 120 EC2
Guiding telescope or lens:TS Optics APO130f6
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, AstroDon 5nm SII filter, AstroDon 5nm OIII filter, ZWO new B, ZWO new G, ZWO new R
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: 4656x3520
Dates:Aug. 14, 2018
Frames:
AstroDon 5nm Ha filter: 9x600" (gain: 139.00) -18C bin 1x1
AstroDon 5nm OIII filter: 8x600" (gain: 139.00) -18C bin 1x1
AstroDon 5nm SII filter: 8x600" (gain: 139.00) -18C bin 1x1
ZWO new B: 10x120" (gain: 139.00) -18C bin 1x1
ZWO new G: 10x120" (gain: 139.00) -18C bin 1x1
ZWO new R: 10x120" (gain: 139.00) -18C bin 1x1
Integration: 5.2 hours
Darks: ~10
Flats: ~10
Flat darks: ~20
Avg. Moon age: 3.51 days
Avg. Moon phase: 13.30%
Mean SQM: 21.20
Mean FWHM: 2.50
Astrometry.net job: 2393230
Locations: Duc, Prayssas, Lot et Garonne, France
Data source: Backyard
Multi star guided.
The version D is a quick test with only SHO channels.
It is interesting to note that after tricolor combination R=SII, G=Ha & B=OIII, I did an SCNR to remove green neutral, which had the effect of giving a good color for stars (no magenta).
This image show how small are the stars as compared to the RGB (slightly below 2 arcsec of FWHM).
Version F : RGB image : the Colo saturation was selectively applied to the stars using a NL light mask
The processing was done in PI as follow (version original):
For each R ,G ,V, Ha, OIII & SII channels :
- Flat Field Dark Substraction
- Flat Field Integration
- Images Calibration (Dark Substraction for RGBSHO and FF correction only for RGB (no need for SHO ...))
- Cosmetic Correction
- Image Registration
- Image Integration
- Noise Reduction (Demure) with 0.9 as variance
Using each integrated channel :
- Created RGB color image using channel combination
- Color balance on stars using a star mask
- Created RGBSHO image using NBLRGB combination tool
- Nonlinear Image Creation using NBRGB values
- Color balance on all image
- Perform SCNR (neutral 70%)
- Color saturation with boost in blue
- Color saturation with mask on star only
Final image adjustments performed in Iphoto on Imac (levels adjustments and deflip)
With 50% mix of an HDRMultiscale image
Pure SHO quickly done
Ha channel
RGB image
Improved (I think) processing in 2019
| ZWO ASI1600MM/QHY163M |
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