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NGC 6888

Mihail Sipatov
18160
Category:Deep Sky
Published:
202
NGC 6888NGC 6874NGC 6881NGC 6888IC 4996
Resolution:
2951x2937 px
File size:
9989 KB

Technical information

Telescope/Lens
Askar 50P Petzval
Camera
ZWO ASI533MC Pro
Mount
HEQ5 Pro
Guide Scope
60х240
Guide Camera
zwo asi 120 MC
Software
siril, fitswork, ACDsee
Location
Владимирская обл., Россия

Light pollution

Green, Bortle 4 zone

Date taken

Exposure

  • 21 × 300″ · ISO/Gain: 100 · Фильтр Duo-Band (OIII+Ha) ZWO, 2''. ·

Total exposure: 1 h 45 m

Comments

Nickolay
Something is off here, we need to figure it out, the equipment clearly allows for a better result.
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Mihail SipatovReply to Nickolay
So tell me what's wrong. Figure it out. That's why I'm here.
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NickolayReply to Mihail Sipatov
This requires the source file after stacking. If everything is the same on it, then we need to look into the shooting process. If it looks fine on it, then we need to check step by step after which stage in processing this blur effect appears, most likely it's noise reduction. If you can provide a link to the FITS file, I'll take a look in the evening.
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Mihail SipatovReply to Nickolay
Thanks! I'll try to provide a link in the evening. Everything is on my home computer. And the blur - I'll say right away - it's noise reduction, because the noise is strong (in my opinion. I compare with DSLRs I used before. Although their sensors are uncooled, they produce less noise). Darks don't help at all. I set the temperature to -10. On the Veil I already lost my temper - I set it to -20. It seems to have gotten a bit better, but it's still not right. I think I'm messing up somewhere in the settings.
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NickolayReply to Mihail Sipatov
If possible, with the final stack, please send three individual frames selectively; the noisy background is strongly affected by the atmosphere, light pollution, haze, and light scattering from streetlights in fog.
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Mihail SipatovReply to Nickolay
https://disk.yandex.ru/d/jzEq9I3YZsyl3A Here is the link to the folder. It contains both lights and darks, and the final FIT and TIFF files just in case. If you need anything else, let me know.
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NickolayReply to Mihail Sipatov
https://drive.google.com/file/d/1dUTFhQDP2j9h_lsCcn3qWAerVqkz_QFV/view?usp=sharing a processing variant of your file
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NickolayReply to Mihail Sipatov
Two questions have arisen looking at the single lights
Under what conditions was the shooting conducted, clouds, fog, streetlights, was there anything that could have influenced it, because for 5min exposures the object showed very poorly
The second question is what noise reducer did you use?
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Mihail SipatovReply to Nickolay
Good evening! There was definitely no cloudiness or fog. There's one lamp and it's far away, and I hid from it. It's the seeing that's been letting me down in recent years: it's as if some kind of film is standing in the upper layers. And the nights on June 7 are no longer nights here. Not completely white of course, but it's a total mess from mid-May to mid-August. Yours turned out more cheerful after processing. What did you process with? I can't remember the noise reducer right now, probably ACDsee or Photoshop. I see that I'm overdoing it with the noise reduction. Remnants of an old photo amateur: I try to remove all noise to zero, as if I'm going to print a 3 by 5 meter poster. I do print them, but in A4 format. And there you can't really make out any noise.
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Mihail SipatovReply to Nickolay
And what settings do you use in ASIAIR? Gain, BIN? Temperature? And everything else. Maybe that's where my mistake is?
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NickolayReply to Mihail Sipatov
Good evening, it's all simple here—paid AI plugins from rc-astro bxt nxt sxt, so basically I understand the main problem is precisely shooting during the short summer nights, in early June they can be said to be already gone, and also the lens is budget, I think it's not even apo sd glass.
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Mihail SipatovReply to Nickolay
I put 2 shots side by side - yours and mine. Mine is terribly blurry! Now I see it myself. Apparently I do get too carried away with noise reduction after all.
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NickolayReply to Mihail Sipatov
Gain 100,bin 1 t-10
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NickolayReply to Mihail Sipatov
You need to denoise using masks, covering the main object; with paid plugins it's all simple—they do everything selectively themselves.
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Mihail SipatovReply to Nickolay
And darks with biases? Everything according to feng shui?
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Mihail SipatovReply to Nickolay
And now will it be possible to download these plugins? Or sanctions? I'm ready to pay, but to whom? Is this all for Siril?
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NickolayReply to Mihail Sipatov
With such a camera, there's essentially not much benefit from darks and biases. I shoot a couple just without them, Siril won't stack, since I stack in auto mode. The main thing is flats.
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NickolayReply to Mihail Sipatov
Yes, starting this year they made them for third-party platforms, not just PixInsight. We need to find someone with a foreign card and cash in dollars. The three of us chipped in 5500₽ each.
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Mihail SipatovReply to Nickolay
I had that suspicion. Judging by the amount of noise, darks aren't really helping here at all. And biases - it's not clear what they're even for.
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Mihail SipatovReply to Nickolay
Understood. So that means a quality photo isn't available to me yet. We'll look for ways. But for now: what is, is. Thanks a lot for the help! And for the constructive criticism!
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NickolayReply to Mihail Sipatov
Don't give up on yourself just yet, your equipment is good, and that's the main thing. Your processing skills will improve over time, and people do process without paid plugins. I've only been using them for a week myself. They just save time, but if you enjoy digging deeper into the subject, you can get excellent results with accessible tools too.
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Mihail SipatovReply to Nickolay
Thank you for the support! Well, then we'll keep it like this for now.
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Nickolay
In my profile header, you can go to my page via the VKontakte button. Subscribe and I'll add you back. If anything, message me.
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