NGC6823

 Posted: Dec 27th, 2024
Show astrometry on hover
NGC
IC
HD
Technical Info
Telescope/Lens: Sky-Watcher 130 PDS
Camera: Canon 550Da
Mount: Vixen gp-dx onstep
Guide Scope: sv106(50mm)
Guide Camera: ZWO 662 MC
Software: DeepSkyStacker, GraXpert, Siril, Photoshop
Accessories: 2" Meyon 1x, Svbony sv220
Exposure:
24 x 300" ISO/Gain: 400
Green zoneLight Pollution:
 Volokolamsk, Russia
 Jul 9th, 2024
2 h 0 m
561
Resolution: 2940x2649 px
Scale: 1290 KB
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Comments

Why is it so grainy and noisy? Maybe you shouldn't have taken 5-minute exposures, but rather more frames at a shorter exposure time? I also have a 550D, but it doesn't produce such grain in my photos.
27 Dec, 2024 Reply
Timastro Replied to Scuttum
Grainy because I forgot to turn on dithering here. Also, I realized that with an uncooled DSLR, it doesn't make sense to use exposures longer than 300 seconds, as the noise becomes overwhelming. Or you have to lower the ISO to 100.
27 Dec, 2024 Reply
Scuttum Replied to Timastro
And even 300 seconds is too much. Two minutes maximum. After that, the noise becomes so strong that nothing can remove it.
28 Dec, 2024 Reply
Timastro Replied to Scuttum
That's exactly why I want a new astro camera with cooling. I'm saving up for it.
29 Dec, 2024 Reply
Scuttum Replied to Timastro
The camera's advantage is a much larger sensor (about 4 times bigger) and autonomy.
30 Dec, 2024 Reply
Timastro Replied to Scuttum
Well, it depends on the astro camera. For example, the ZWO 2600 MC PRO actually has a slightly larger sensor. So the ZWO 533 MC PRO doesn't count.
31 Dec, 2024 Reply
Scuttum Replied to Timastro
That's true, but it also costs as much as a Boeing wing. :) For that money, you could buy 5 cameras.
Although, of course, the sensors in regular Canons aren't designed for astrophotography and deliver what they're capable of.
2 Jan, 2025 Reply

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