DeepSkyHosting

M33

Alex Ch
1892985
Category:Deep Sky
Published:
567
M33NGC 592NGC 603IC 134IC 136IC 137IC 139IC 140NGC 588NGC 595NGC 598NGC 604IC 131IC 132IC 133IC 135IC 142IC 143
Resolution:
2733x1820 px
File size:
5029 KB

Technical information

Telescope/Lens
Sky-Watcher Quattro 150
Camera
Canon 200D, Canon 650D mod
Mount
Sky-Watcher HEQ5 PRO SynScan
Guide Scope
60 mm Guide Scope
Guide Camera
ZWO ASI 178MM
Accessories
Zwo Asi Air Plus, СС 0, 85х
Software
Pixinsight, PhotoShop
Location
Новосибирская область, Верх-Ирмень, Россия

Light pollution

Green, Bortle 4 zone

Date taken

Exposure

  • 100 × 120″ · ISO/Gain: 1600 ·
  • 120 × 60″ · ISO/Gain: 1600 · Optolong L-eNhance ·

Total exposure: 5 h 20 m

Photo versions

M33
Current photoUpdated
M33

Nov 1st, 2025

5 h 20 m

M33
M33

Sep 29th, 2025

3 h 20 m

Crop

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Previous version
Current version

Comments

oeswww
I can't figure out what brightness the galaxy should be and what color it should be. For me, no matter how I color calibrate, it always turns out warm-toned and quite saturated. For others, it's somewhat dim and grayish-blue. Yours turned out neutral with a bluish tint. Where is the truth?)
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Alex ChReply to oeswww
The thing is, this is essentially the L-channel, and color would be better captured with a monochrome camera and LRGB filters. By the way, I toned down the bluish tint a bit—after PixInsight, it was shifted more toward the blue spectrum. Also, I couldn’t manage to calibrate the color on this one; if I succeed later, I’ll update with a new version—that would be interesting too.
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Lzaza
The galaxy is incorrectly stretched, the arms are lost, and it looks like a plate—no offense.
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Alex ChReply to Lzaza
No offense, I liked this version. It looks very different in many people's photos. Radically different, in fact. I kept about 90% of what I stacked. Although I could have removed the halo. Honestly, I'm not a fan of this processing, but I didn't want to stray from the result just to follow popular trends instead of the actual data. The only thing I seriously dislike is how I added the hydrogen nebulae.
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