M42, NGC 1976, Sh-2 281 Composite

 Posted: Feb 13th, 2026
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NGC
IC
HD
Technical Info
Telescope/Lens: Askar 71F
Camera: ZWO ASI533MC Pro
Mount: JUWEI 14
Guide Scope: Askar 32 f4
Guide Camera: ZWO ASI120MM Mini
Software: Siril, GraXpert, Lightroom, StarNet++
Accessories: CAA, EAF, ASIAIR MINI
Exposure:
22 x 180" ISO/Gain: 100 - Optolong Moon and Skyglow 1.25
117 x 60" ISO/Gain: 100 - L-Pro
Orange, Bortle 6 zone:
 Samara, Russia
 Jan 10th, 2026
3 h 3 m
31
Resolution: 2905x2215 px
Scale: 1661 KB
It turns out the reducer can eat away detail. Here is a composite of two stacks from different filters and different focal lengths. The goal was to bring back the sharpness from the old image into the shot with the reducer. I have to admit that I couldn't fully restore the sharpness. The SNR improved nicely in the center of the frame, leaving a noisy border, and I had to get clever with a mask to fix the bug. The colors mixed interestingly from the different filters; I wanted to adjust the color to be closer to the latest version. Some Herbig-Haro objects were partially lost, which is unfortunate, but as a learning process, it turned out quite engaging. In short, it's possible, but not advisable. I think that's enough M42 for now. Sorry for the photo spam—I only recently posted a similar one. P.S. The shot with the reducer was also taken under terrible seeing for my location.
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Comments

Is it the telescope or the reducer in it that produces stars like these?
A reducer is always a compromise...
Today, at 19:36 Reply

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