Crescent in RGBHOO from Bortle 9 sky (Andres Salaverria)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

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Crescent in RGBHOO from Bortle 9 sky

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Crescent in RGBHOO from Bortle 9 sky

By accident more than by design I used two different filters in two different nights. I imaged the Crescent in night one with the L-pro for a straightforward RGB image. In night two I used the L-Ultimate double narrowband filter. And this gave me the opportunity to see the difference in the images. The first revision is the L-Pro, the second one the L-Ultimate and in the final image I combined both sets of subs. I used APP to combine the channels using the RGBHOO add-scale algorithm. I used a factor of 2 for the Ha channel and 1.442 for the OIII channel. Nothing scientific about these values: Trial and error to the aesthetics of the image. I am amazed that I managed to get some blue. You probably need good eyes to see it. Comments?

Original
B
Final
C

B

Title: Crescent - HA and OIII channels only

Uploaded: ...

Askar Telescopes
Broadband under Bortle 7/8/9
ZWO ASIAIR PRO USERS
Suburban Astrophotography

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Status	Basic success
Started	...
Astrometry.net job	8479273
PixInsight job	n/a
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Crescent in RGBHOO from Bortle 9 sky

Crescent in RGBHOO from Bortle 9 sky

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Crescent in RGBHOO from Bortle 9 sky

Crescent in RGBHOO from Bortle 9 sky

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