Caldwell 27 HOO RGB Stars

Posted: May 30th, 2026

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NGC

IC

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Technical Info

Telescope/Lens: Askar 71F

Camera: ZWO ASI585MC Pro

Mount: JUWEI 14

Guide Scope: ToupTek GS-200 AR

Guide Camera: ZWO ASI662MC

Software: Siril, Photoshop, Lightroom, StarNet++

Accessories: CAA, EAF, EFW, ASIAIR MINI, Askar Reducer x 0.75, Gemini PowerBox

Exposure:

62 x 300" ISO/Gain: 200 - Optolong L-eXtreme

39 x 300" ISO/Gain: 200 - SVBONY SV220 SII OIII

15 x 60" ISO/Gain: 200 - Optolong UV IR Cut

Orange, Bortle 6 zone:

Samara, Russia

May 30th, 2026

8 h 40 m

9

2

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Resolution: 3670x2064 px

Scale: 4471 KB

183

HOO version, Ha from Lextrem, and for the oxygen channels I combined data from two filters (G+B) + (G+B), roughly speaking. Preparing the base for SHO HSO. Stars processed separately with UVIR.

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