Caldwell 4

Posted: Sep 15th, 2026

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NGC

IC

HD

Technical Info

Telescope/Lens: Askar 71F

Camera: ZWO ASI585MC Pro + ZWO ASI2600MM 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:

91 x 300" ISO/Gain: 200 - Optolong UV IR Cut

54 x 300" ISO/Gain: 100 - Antlia PRO OIII 3 nm

Yellow, Bortle 5 zone:

Samara, Russia

May 19th, 2026

12 h 5 m

9

2

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Resolution: 3662x2747 px

Scale: 6539 KB

241

Decided to play with the data I have. The main backbone of the image is 7 hours with the 585mc pro. I extracted the L channel from this data and combined it with 3 hours of L from the 2600mm. The result was a combined L, and I took the colors from the 585. A great warm-up for the brain, while I shot a little on the mono of the Iris, and my hands are always itching.

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