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IC 1805

poiskovik_RZN
521027
Category:Deep Sky
Published:
532
IC 1805IC 1805
Resolution:
3756x2076 px
File size:
36185 KB

Photo description / processing

Decided to change the processing... still wanted something closer to narrowband data... no clear weather, so we're practicing, pushing pixels around the screen.

Technical information

Telescope/Lens
SkyWatcher 200/1000PDS
Camera
ZWO ASI 585 mc pro
Mount
homemade harmonic mount
Guide Scope
OAG Askar
Guide Camera
220mm zwo
Accessories
sharpstar 0.95 mpcc
Software
siril, PS, GraXp, asi air mini
Location
Елатьма, Россия

Light pollution

Yellow, Bortle 5 zone

Date taken

Exposure

  • 90 × 300″ · ISO/Gain: 0 · Optolong L-Quad Enhance
  • 498 × 120″ · ISO/Gain: 200 · Optolong L-Quad Enhance

Total exposure: 24 h 6 m

Photo versions

IC 1805
Current photoUpdated
IC 1805

Feb 27th, 2026

24 h 6 m

Decided to change the processing... still wanted something closer to narrowband data... no clear weather, so we're practicing, pushing pixels around the screen.

IC 1805
IC 1805

Feb 7th, 2026

24 h 6 m

In January, there were several cloudless and cold nights. I took advantage of this and increased the integration time on the target. The atmosphere was not ideal; although there was no moon in the sky, the stars appeared dim. The resulting integration did not turn out much better than before, but it is certainly no worse.

IC 1805
IC 1805

Jan 6th, 2026

4 h 35 m

Although the total exposure time is short, testing the new sensor brought a lot of positive results.

Show changes
Previous version
Current version

Comments

poppy8micro
Comment on photo: IC 1805from
Why do you take photos at different gain settings? The 585 starts HCG at 252. Or is there some trick?
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poiskovik_RZNReply to poppy8micro
Comment on photo: IC 1805from
I noticed that I prefer the colors at 0 gain, and at high gain 200 I tried to capture more details. However, I'm not very experienced in shooting and processing such objects, so my approach might be misguided. As for NCM, I can't say much yet—I don't understand much about it.
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poppy8micro
Comment on photo: IC 1805from
It would also be interesting to see just the processed gain 0 frame separately and separately the gain 200 frame, and compare them. What actually comes out. Thanks)
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poppy8microReply to poiskovik_RZN
Comment on photo: IC 1805from
Yes, on the 533, after 100, it's 585 after a gain of 252. That's due to sensor characteristics. I tried it with a gain of 0 and didn't really like it. Another nuance: if the camera isn't flashed with firmware after August 2025, then use 252. If the camera is new or flashed to the latest version, then use a gain of 200.
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poppy8microReply to Konstantin Tihonov
Comment on photo: IC 1805from
Thank you for the corrections, yes, that's correct, gain 200 is the HCG mode for the 585. However, with the caveat I mentioned earlier about the release date and drivers. Screenshots from the official website with information about gain 252 are still circulating. But currently, the official graph shows 200.
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Konstantin TihonovReply to poppy8micro
Comment on photo: IC 1805from
The software doesn't detect the 585, at least in MM.
And in the software, only the focuser and filter wheel updates are available. SharpCap also doesn't recognize it properly with the full name ASI 585mm Pro.
It only shows ASI cam 1
and ASI cam 2 :)). I don't know why it's like this. With Nina and ASIStudio, everything is fine.
They both detect everything, including the camera's s/n and driver version. All settings are available and working. Maybe the 585ms version doesn't have this issue. Waiting to hear what Evgeny says!?
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poppy8micro
Comment on photo: IC 1805from
I recommend that in the next session you run an experiment and capture all frames with a single gain of 252, along with darks and flats using the same gain and sensor temperature. Let's see how it turns out—I'm confident the result will be solid.
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poppy8micro
Comment on photo: IC 1805from
You can also perform a sensor analysis in SharpCap, and it will automatically generate a graph showing where the read noise drops.
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