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A Walk in Cygnus From Crescent to Propeller– 2 panels  - 4 palettes, 



A Walk in Cygnus From Crescent to Propeller– 2 panels - 4 palettes

Technical card

Dates:July 17, 2019

ZWO HAlpha 7nm: 207x120" (gain: 139.00) -20C bin 1x1
ZWO O-III 7nm: 285x120" (gain: 139.00) -21C bin 1x1
ZWO S-II 7nm: 219x120" (gain: 139.00) -20C bin 1x1

Integration: 23.7 hours

Avg. Moon age: 15.32 days

Avg. Moon phase: 99.65%

Bortle Dark-Sky Scale: 8.00

Basic astrometry details job: 2916742

Resolution: 4176x3313

Data source: Backyard


This was a big but exciting project to capture SHO data on 2 panels during summer short nights.
I used my Canon 200mm paired with the ASI1600MM under heavy LP (SQM 18.3)
Image integration was also epic with 285 O3 frames ; 207Ha and 219 SII but APP made the job easily.

The next challenge was the processing : I opted for HOO / HOO ToneMap / SHO / SHO ToneMap.
The idea was to try as much tonal variation as possible with these 4 common techniques.
Still, I could have added a pinch of SII in the HOO but opted not too.

A few comments on each image

HOO : weak O3 but discernable, red / pink tones

HOO TM : O3 more discernable, brownish area

SHO : O3 is weak and totally overpowered by Ha and S2. Interesting palette even if some may find it too monotone

SHO TM : pretty photogenic, high impact I guess, lots of shades.

I like all 4 images and I’m pretty happy with the end result.

Special mention to my friend Cyber (Victor Van Puyenbroeck) and Jon Rista : thank you for your feedbacks !!!!

Let me know what you think of this project and which image you like most !
CS to all !



License: None (All rights reserved)


A Walk in Cygnus From Crescent to Propeller– 2 panels  - 4 palettes,