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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:Starlight Xpress AO Unit , ZWO EFW 31mm 8 positions , QHYCCD PoleMaster , Innovations Foresight ONAG , USB_Focus V3 Usb Focus , USB Stepper Motor Heavy Load
Dates:May 10, 2018 , Aug. 10, 2018 , Aug. 15, 2018
Frames:
AstroDon 5nm Ha filter: 3x300" (gain: 139.00) -15C bin 1x1
AstroDon 5nm Ha filter: 6x600" (gain: 139.00) -15C bin 1x1
AstroDon 5nm OIII filter: 3x300" (gain: 139.00) -15C bin 1x1
AstroDon 5nm OIII filter: 5x600" (gain: 139.00) -18C bin 1x1
ZWO new B: 6x120" (gain: 139.00) -18C bin 1x1
ZWO new G: 6x120" (gain: 139.00) -18C bin 1x1
ZWO new R: 6x120" (gain: 139.00) -18C bin 1x1
Integration: 2.9 hours
Avg. Moon age: 19.14 days
Avg. Moon phase: 16.80%
Astrometry.net job: 2444705
Resolution: 4486x3390
Locations: Duc, Prayssas, Lot et Garonne, France
Data source: Backyard
This image is the combination of the 30 min exposure of the May 10th earlier this year with the summer data of this nebula.
The seeing was not so good on these exposures (R: 3", B: 3.5", Ha: 2.7", O3: 3.5")
I have included the :
- H alpha version
- the RGB data
- the final version is a test to further match the star color with the RGB color without artifact. I have used a Max functionin PixelMath, something like :
Max(RGBHOO , RGBHOO * (1-starmask) + RGB * starmask)
The max function is efficient to avoid dark ring around star.
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 1 as variance
Using each integrated channel :
- Created RGB color image using channel combination
- Color balance on stars
- Created RGBSHO image using NBLRGB combination tool
- Nonlinear Image Creation using NBRGB values
- Color balance on all image
- Perform SCNR (neutral 100%)
- Color saturation with boost in blue and mask to protect dark area.
- Final manual color balance to boost blue
Final image adjustments performed in Iphoto on Imac (levels adjustments, +15% color sat, +10% definition, and deflip & crop)
Description: H alpha
Description: RGB
Description: Star color adjusted in HOO-RGB
Description: Same as E but with a darker sky background
| ZWO ASI1600MM/QHY163M |
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