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M33

Category:Deep Sky
Published:
349
M33NGC 592NGC 603IC 134IC 136IC 137IC 139IC 140NGC 588NGC 595NGC 598NGC 604IC 131IC 132IC 133IC 135IC 142IC 143
Resolution:
4250x3234 px
File size:
10618 KB

Photo description / processing

I've reprocessed my work on the Triangulum Galaxy. It seems there are no more green stars now :)

Technical information

Telescope/Lens
SharpStar 76EDPH
Camera
Zwo 1600mm
Mount
EQ6 R Pro
Guide Scope
OAG
Guide Camera
ZWO ASI220MM
Software
Pixinsight
Location
Мозырь, Беларусь

Light pollution

Yellow, Bortle 5 zone

Exposure

  • 60 × 60″ · ISO/Gain: 139 · R
  • 60 × 60″ · ISO/Gain: 139 · G
  • 60 × 60″ · ISO/Gain: 139 · B

Total exposure: 3 h 0 m

Photo versions

M33
Current photoUpdated
M33

Mar 29th, 2026

3 h 0 m

I've reprocessed my work on the Triangulum Galaxy. It seems there are no more green stars now :)

M33
M33

Jan 20th, 2026

2 h 33 m

The M33 galaxy in the constellation Triangulum. One of the nearest galaxies to us, it belongs to our galaxy cluster, the Local Group. RGB image. I spent a long time working on it. My eyes got tired, so I took a break. I didn’t add an L channel because I had to reduce the galaxy’s brightness when converting from linear to nonlinear. Something like that... I guess I couldn’t avoid some haze here either. But also, not many frames were captured. As they say, it is what it is.

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Comments

CatS
I blend the L channel on a linear image, then everything matches in brightness.
Actually, it's better not to shoot L at all—fewer problems that way.
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Robert NikReply to CatS
I didn't get why I should shoot L either. I've processed about six of them and never ended up using that L anywhere.
I do almost all my processing on the linear image. Stretching is almost always the last step before saving the final result.
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