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 Post Posted: Wed Nov 08, 2017 6:14 am 
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Joined: Wed Jan 11, 2017 11:29 pm
Posts: 6
Hi Sam,

I just received the ASI1600 MMC Pro and am finding a pattern in the integrated images. This is about 6 hrs of Ha data. It is calibrated with darks and dark flats - although it looked more or less the same without any calibration. All frames were dithered aggressively. Gain 200 / 300 @ 300 seconds.

Is the look of this image normal or is something not right?

Here is a link to the file if you need it:

https://www.dropbox.com/s/o0sp5yox6r6zsvq/Ha.fit?dl=0


Attachments:
File comment: What looks like a checkerboard canvass pattern
pattern.JPG
pattern.JPG [ 195.67 KiB | Viewed 146 times ]
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 Post Posted: Wed Nov 08, 2017 7:30 am 
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Joined: Thu Feb 21, 2013 2:51 am
Posts: 2292
I think this is shot noise
maybe need stack more?

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 Post Posted: Wed Nov 08, 2017 5:18 pm 
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Joined: Mon Aug 01, 2016 3:51 pm
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Take more ?
If 6 hours doesn't make it disappear...


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 Post Posted: Sat Nov 11, 2017 3:31 pm 
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Joined: Wed Jul 26, 2017 11:44 pm
Posts: 14
are you dithering? There almost seems to be repetitive pattern areas? (AC noise?) Still it should stack out. Is it in your darks?


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