NGC 7822 on a stock DSLR | Astrobiscuit | Page 1

somber dagger Oct 3, 2025, 9:11 AM

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Core of the NGC 7822, shot from my Bortle 5 backyard.

126 x 180" images, total integration 6 hours 18 minutes.

Telescope: Sky-Watcher Explorer 130PDS
Camera: Canon EOS 60 D
Filter: Optolong UHC
Controls: Asiair Mini
Guiding: Asi 120mm Mini + 50/180mm guide scope
Mount: Sky-Watcher EQM-35 Pro

Processed in Siril+GraXpert+Darktable

I'm really struggling with my processing, but managed to get decent nebulosity with somewhat minimal noise.

That's the best I can do at the moment, tips are welcomed 😄

tropic kernel Oct 3, 2025, 9:22 AM

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Great image, love the diffraction spikes

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I can also see some hints of background dust as well

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Did you dither?

somber dagger Oct 3, 2025, 9:59 AM

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tropic kernel Did you dither?

Yep, every 5 subs

tropic kernel Oct 3, 2025, 10:29 AM

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If your mount can take it try dithering more often

somber dagger Oct 3, 2025, 10:31 AM

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I'll dither every 2-3 subs, once I get my RMS better. Currently my errors are around 1-3" for RA and 1-2 for DEC... and I don't know how to improve it any more 😄

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Sometimes it takes up to a minute for the mount to stabilize after dithering, so that's why I currently dither only every 5 subs

tropic kernel Oct 3, 2025, 10:33 AM

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I had the same pattern noise with my DSLR and I found the best way to remove it is longer exposures to swamp read noise and dithering more often

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But if your mount can't take it it'll harm more than benifit

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Try tighten everything down in ur mount

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That helped me alot

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Like make sure the focuser on the guide scope is tight

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The mount to tripod connection is tight

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The PA screws should be tight

somber dagger Oct 3, 2025, 10:37 AM

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I guess I could do 300" exposures, at least on targets higher up on the sky. I could also dither more often, but it would require longer nights or multiple sessions to get enough light 😄

I guess I could try check the connections. The mount itself should be adjusted, but especially the guide connections could be more solid

tropic kernel Oct 3, 2025, 10:37 AM

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somber dagger I guess I could do 300" exposures, at least on targets higher up on the sky. I c...

Yeah if it becomes a pain don't do try the longer exposures

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First get the guiding down

somber dagger Oct 3, 2025, 10:39 AM

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I also need a dew heater... currently I'm strapping on single-use hand warmers with rubber bands 😂

tropic kernel Oct 3, 2025, 1:05 PM

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Just get the cheap svbony ones

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They work

#NGC 7822 on a stock DSLR