Sh2-129 Ou4 The Squid (HOO)

 Posted: Jan 25th, 2023
Technical Info
Telescope/Lens: Askar FRA600
Camera: QHY600L
Mount: Sky-Watcher AZ-EQ6 Pro
Guide Scope: Evoguide ED50
Guide Camera: asi274mm mini
Software: PixInsight
Accessories: Reducer 0.7x
Exposure:
127 x 300" ISO/Gain: 25 - OIII
52 x 300" ISO/Gain: 25 - Ha
Orange zoneLight Pollution:
 Moscow, Russia
 Jul 25th, 2022
14 h 55 m
1443
I saved and saved, but never saved enough... still need to save and save more oxygen.
Resolution: 5796x4068 px
Scale: 11533 KB
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Comments

Okay, but let's clean up the noise.
25 Jan, 2023 Reply
Dmitrii Replied to Smirnov Andrey
Thanks, yes, the calibration went a bit off, noticed it at the last moment. Need to gather more oxygen, then I'll try to restack everything from scratch. Quite a tricky squid...
25 Jan, 2023 Reply
Smirnov Andrey Replied to Dmitrii
It's not about accumulation; you just need to apply a noise reduction filter to the high frequencies. This won't reduce detail but will make the image more pleasing. Something like this:
https://disk.yandex.ru/i/yzQSpnTjuj-IQw
25 Jan, 2023 Reply
Dmitrii Replied to Smirnov Andrey
Andrey, I agree, that's much better; the pixels on the squid are gone. I haven't fully mastered the noise reduction tools yet—there are many, and at different stages. So far, I've only used them on the linear image before combining channels. Another mistake here is that I suppressed the faint stars to bring out the nebula, which left a lot of artifacts. And the background is completely uneven. More integration time wouldn't hurt here either; it was very difficult to pull out this squid, especially since the hydrogen is too bright.
26 Jan, 2023 Reply

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