IC 1805

 Posted: Feb 27th, 2026
Show astrometry on hover
NGC
IC
HD
Technical Info
Telescope/Lens: SkyWatcher 200/1000PDS
Camera: ZWO ASI 585 mc pro
Mount: homemade harmonic mount
Guide Scope: OAG Askar
Guide Camera: 220mm zwo
Software: siril, PS, GraXp, asi air mini
Accessories: sharpstar 0.95 mpcc
Exposure:
90 x 300" ISO/Gain: 0 - Optolong L-Quad Enhance
498 x 120" ISO/Gain: 200 - Optolong L-Quad Enhance
Yellow, Bortle 5 zone:
 Elatma, Russia
 Jan 24th, 2026
24 h 6 m
57
Resolution: 3756x2076 px
Scale: 36185 KB
Decided to change the processing... still wanted something closer to narrowband data... no clear weather, so we're practicing, moving pixels around on the screen.
Current photo Updated
  Today, at 19:01
  24 h 6 m
Decided to change the processing... still wanted something closer to narrowband data... no clear weather, so we're practicing, moving pixels around on the scree…
  7 Feb, 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 idea…
  6 Jan, 2026
  4 h 35 m
Although the total exposure time is short, testing the new sensor brought a lot of positive results.
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Comments

Why do you take photos at different gain settings? The 585 starts HCG at 252. Or is there some trick?
Today, at 19:52 Reply
Poiskovik_rzn Replied to Poppy8micro
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.
Today, at 19:57 Reply
Poppy8micro Replied to Poiskovik_rzn
HCG, sorry. That's the low-noise readout mode in our cameras.
Today, at 19:59 Reply
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)
Today, at 20:03 Reply
Poiskovik_rzn Replied to Poppy8micro
Alright, I'll try to do a comparable processing. I'll add it in the comments when it's ready, if you're interested. Do you always shoot in HCG?
Today, at 20:10 Reply
Poppy8micro Replied to Poiskovik_rzn
Yes, on the 533 it's after 100, on the 585 after 252 gain. That's just the nature of these sensors. I tried it at gain 0 and didn't really like the result.
Today, at 20:12 Reply
Poppy8micro Replied to Poiskovik_rzn
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.
Today, at 20:16 Reply
Poiskovik_rzn Replied to Poppy8micro
And how do you find out? About the firmware. Well, I bought it from the Chinese, no idea what firmware is on it))))
Today, at 20:19 Reply
Poppy8micro Replied to Poiskovik_rzn
Or just flash it on the computer using the ZWO software.
Today, at 20:21 Reply
Konstantin Tihonov Replied to Poppy8micro
You are mistaken; at 585, HCG is enabled at 200 gain.
Today, at 22:28 Reply
Poppy8micro Replied to Konstantin Tihonov
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.
Today, at 22:41 Reply
You can also perform a sensor analysis in SharpCap, and it will automatically generate a graph showing where the read noise drops.
Today, at 20:20 Reply
Poiskovik_rzn Replied to Poppy8micro
Thanks, I'll look up that method.
Today, at 20:21 Reply
Poppy8micro Replied to Poiskovik_rzn
Just look it up on Google. That's the only way in our line of work.
Today, at 20:23 Reply

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