DeepSkyHosting
Sign inRegister

SH2-129

Anton Gromov
74920
Category:Deep Sky
Published:
1021
SH2-129
Resolution:
5841x3946 px
File size:
29431 KB

Technical information

Telescope/Lens
Askar SQA55
Camera
ZWO ASI2600MC PRO
Mount
Juwei 17-100 Mount
Guide Scope
Sky-Watcher 8x50 Finder Scope
Guide Camera
ZWO ASI 120 MM mini
Accessories
ZWO ASIAIR Mini, SVBONY SV220 Dual-Band Ha 7nm OIII 7nm Filter
Software
DeepSkyStacker, Siril, GraXpert
Location
Хулхута, Россия,

Light pollution

Gray, Bortle 2 zone

Date taken

Exposure

  • 485 × 300″ · ISO/Gain: 100 · SV220. -10c ·

Total exposure: 40 h 25 m

Photo versions

SH2-129
Current photoUpdated
SH2-129

Sep 28th, 2025

40 h 25 m

Show changes
Previous version
Current version

Comments

Oleg Novoselov
Comment on photo: SH2-129from
A bold attempt!
But there's a feeling that more could be drawn from this material.
If you can share the sum, it would be interesting to try.
Reply

Sign up or sign in to leave a comment.

RegisterSign in
Oleg NovoselovReply to Anton Gromov
Comment on photo: SH2-129from
Here's what I got from the 16-bit version: https://cloud.mail.ru/public/upUn/45zed5XZw
But from the series, nothing came out—it feels like it was shot without a filter at all. Even with maximum stretching, only a bit of red is visible.
Could the files have been mixed up?
Reply

Sign up or sign in to leave a comment.

RegisterSign in
Anton GromovReply to Oleg Novoselov
Comment on photo: SH2-129from
It seems not. Is the squid more noticeable in your version than in the processed one?
Uploaded a new version of the 32-bit stack with 38 hours of exposure. https://cloud.mail.ru/public/Jy8k/afwHeEJHP
Reply

Sign up or sign in to leave a comment.

RegisterSign in
Oleg NovoselovReply to Anton Gromov
Comment on photo: SH2-129from
PixInsight, PS
I'll try to process this version when I have time, and I also want to point out the focus. I measured the files you sent me, and it turns out the sharpness is twice as low as in mine, even though our setups are the same.
Reply

Sign up or sign in to leave a comment.

RegisterSign in
Oleg NovoselovReply to Anton Gromov
Comment on photo: SH2-129from
Already more interesting, what gain are you shooting with? I saw somewhere that you set it to 300.
And is the focusing done manually or with an electronic focuser?
My computer wouldn't even be enough to stack 38 hours.
Reply

Sign up or sign in to leave a comment.

RegisterSign in
Anton GromovReply to Oleg Novoselov
Comment on photo: SH2-129from
Yes, I alternate. One night at gain 300, the next at 100. Focusing manually using Asiair tools, with constant checking. FWHM is usually around 1.85. I aim for better values. The atmosphere allowed a maximum of 1.60 at best, but then it drifts back to around 1.80.
Reply

Sign up or sign in to leave a comment.

RegisterSign in
Oleg NovoselovReply to Anton Gromov
Comment on photo: SH2-129from
You're mistaken about that. At 300 gain, your dynamic range drops to about 10.5, while at 100 it's nearly 14—a difference of almost 2 stops. That's why your stars turn into colorless blobs. Try stacking what you shot at gain 100, then with the same reference frames at gain 300, and you'll see the difference. If I were you, I'd shoot at 600-second exposures with gain 100. My FWHM usually hovers around 1.50; when it's 1.7, you can tell it's not sharp.
Reply

Sign up or sign in to leave a comment.

RegisterSign in

More photos by Anton Gromov