Sadr Region

kirpersidsky

31522

Deep Sky

Dec 30th, 2024

1469

Resolution:: 1980x1980 px
File size:: 2904 KB

Technical information

Telescope/Lens: Samyang 135mm f/2 ED UMC
Camera: Sony SLT-A57 modified cooled
Mount: OG startracker, surveyor tripod
Accessories: SVbony SV220
Software: Siril, GraXpert, Adobe Photoshop

Location: Асино, Россия

Light pollution

Green, Bortle 4 zone

Date taken: Sep 13th, 2024

Exposure

220 × 45″ · ISO/Gain: 800 · Sep 13th, 2024

Total exposure: 2 h 45 m

Photo versions

Current photoUpdated

Sadr Region

Dec 30th, 2024

2 h 45 m

Sadr Region

Sep 26th, 2024

3 h 11 m

I've accumulated a bit more signal from the green zone and added it to what I captured from the city. In theory, I increased the SNR by 2.5 times (based on the number of added frames). The filter I'm using is far from ideally compatible with such fast optics (recommended value f5), which makes it impossible to achieve focus in both the red and green/blue channels simultaneously. Giving priority to the red channel, I found a somewhat middle ground for both passbands. So, can't do without blur.

Sadr Region

Sep 7th, 2024

30 m

Show changes

Comments

Sergeich

Sadr Regionfrom 09/07/2024

Beautiful. I like it. I'm surprised it turned out so detailed and clean in just half an hour.

Sep 8th, 2024

SlideReply to Sergeich

Sadr Regionfrom 09/07/2024

BXT works wonders)

Sep 9th, 2024

kirpersidskyReply to Sergeich

Sadr Regionfrom 09/07/2024

Thank you! Of course, there's quite a bit of noise reduction applied here, but modern tools allow for good results even with limited integration time. Cooling certainly played its role as well. Each time, I aim to gather more signal, but due to weather or other reasons, it doesn't work out, and I have to pull out what I can from what's available. It becomes tempting to shoot like this every time. I hope someday to capture enough material that I can manage without noise reduction altogether.

Sep 9th, 2024

kirpersidskyReply to Slide

Sadr Regionfrom 09/07/2024

Well, of course! But honestly, the material was already pretty good—I even thought about not running it through bxt. And that’s despite the hydrogen being a bit soft due to inaccurate focus and the bandpass shift at f/2.8. It’s still better to let the oxygen go slightly out of focus. But since this was a test session, I didn’t bother fine-tuning it. Anyway, once you get hooked on this, there’s no going back.

Sep 9th, 2024

SlideReply to kirpersidsky

Sadr Regionfrom 09/07/2024

I don't mind modern processing methods! But really, it's worth accumulating at least a few hours of data—the result will be even better!
Did you stretch the histogram somewhere, in GraXpert? I just don't see PixInsight mentioned in the description, so it's not very clear.

Sep 9th, 2024

kirpersidskyReply to Slide

Sadr Regionfrom 09/07/2024

Yes, that's clear and needed. The detail will be higher. Just haven't had luck with the weather yet. I processed it in Siril, all the basic processing was done there. Using the modified arcsinh transform in the GHST tool.

Sep 9th, 2024

Evgeniy Osharov

Sadr Regionfrom 09/07/2024

Can I see a single star?

Sep 9th, 2024

kirpersidskyReply to Evgeniy Osharov

Sadr Regionfrom 09/07/2024

https://drive.google.com/file/d/19qZKtB5ISBoZtsy9heUiCvGJ1IYOr-bw/view?usp=share_link

Sep 10th, 2024

kirpersidskyReply to Evgeniy Osharov

Sadr Regionfrom 09/07/2024

https://drive.google.com/file/d/19qZKtB5ISBoZtsy9heUiCvGJ1IYOr-bw/view?usp=share_link

Sep 10th, 2024

Evgeniy OsharovReply to kirpersidsky

Sadr Regionfrom 09/07/2024

Thank you! Plugins certainly add a nice touch (I wouldn't call it beauty) and allow you to, for example, reduce noise, but they also significantly distort details and remove or add stars.

Sep 10th, 2024

kirpersidskyReply to Evgeniy Osharov

Sadr Regionfrom 09/07/2024

It depends on which ones. For Topaz Denoise, that's true—I don't like that either, so I don't use it. BXT and Graxpert Denoise don't add anything; I've checked by comparing them with the original stack.

Sep 10th, 2024

Evgeniy Osharov

Sadr Regionfrom 09/26/2024

Your blurs are blurring everything xD Signal from the blue zone, but the bubble didn't show up, or got destroyed in the blurring process, bravo )

Sep 26th, 2024

kirpersidskyReply to Evgeniy Osharov

Sadr Regionfrom 09/26/2024

Sorry, not an astro camera. As for that bubble, it wasn't even there before the blur.

Sep 26th, 2024

kirpersidskyReply to Evgeniy Osharov

Sadr Regionfrom 09/26/2024

I agree, blur does introduce a lot of noise if there isn't enough integration time, which then has to be smoothed out. But that's what blur is all about—just a bit of fun, really.

Sep 26th, 2024

Evgeniy OsharovReply to kirpersidsky

Sadr Regionfrom 09/26/2024

I'm referring to the one towards the bright star at the top. Usually, it at least has some outline shape.

Sep 26th, 2024

kirpersidskyReply to Evgeniy Osharov

Sadr Regionfrom 09/26/2024

Yes, I understand. The Soap Bubble Nebula (PN G075.5+01.7) isn't visible even on the original stacked image. Additionally, my oxygen filter data is out of focus, so only the brightest details in it have come through.

Sep 27th, 2024