this post was submitted on 26 Dec 2025
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Astrophotography

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Equipment used:

  • Lumix G85
  • Lumix 100-300 f4-f5.6
  • SA-GTI

Image:

  • 10 sec, f/6.3, 6400 ISO
  • 1200 Lights
  • 50 Biases, Darks, Flats

Stacked using Siril and edited in GIMP

As you can see, there is a lot of noise, even with heavy editing and noise reduction in siril as well as in GIMP, and I'm out of ideas of what could cause it. I tried different exposures (from 10s to 30s), different ISOs (1600-6400). I tried to manually dither by moving the mount through the App every 30 minutes or so. I also used a lens dew heater at different temperatures ranging from 15°C to -5°C with no difference in noise.

I got a successful result a few months ago with the Orion nebula, the only differences were the exposure of 5 seconds and a Omegon Mount MiniTrack LX3 Essentials mount which couldn't be polar aligned very well. I can't imagine that the difference from 5 to 10 seconds exposure did all the difference.

Can anyone help me?

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[–] Linsensuppe@feddit.org 1 points 2 days ago (1 children)

AFAIK NINA doesn't work with my camera, but since my mount is within Wi-Fi reach of me, I can move the GTI through the app slightly from inside. My question with that is, how much do I have to/should I dither? Currently, I move the stars so that there is a significant jump on the SLR screen, so I would guess it's a few hundred pixels in x and y direction.

[–] lefty7283@lemmy.world 2 points 2 days ago

Few hundred pixels is definitely enough, and kinda overkill (mine goes a few dozen). I think the frequency of the dithers is probably the main thing that could help with the noise