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Old 29-08-2021, 04:35 PM
Mickconn77 (Mick)
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Issue with brindle-like noise on Sii filter

Getting strange noise on only one of my narrowband filters.
Have read other forums that suggest dithering would fix it, however I’m already dithering.
Any suggestions are welcome!

Have purposely overexposed the attached image to make the noise more conspicuous.
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Last edited by Mickconn77; 29-08-2021 at 04:36 PM. Reason: Add picture
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Old 29-08-2021, 05:09 PM
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multiweb (Marc)
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That's walking noise. Is this a cooled camera? How cold is it?
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Old 29-08-2021, 07:44 PM
Mickconn77 (Mick)
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Quote:
Originally Posted by multiweb View Post
That's walking noise. Is this a cooled camera? How cold is it?
Yeah it’s cooled. 1600mm pro. Cooled to -5.

No other filters get it, just the Sii, which I thought was strange.
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Old 29-08-2021, 09:04 PM
Mickconn77 (Mick)
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Ok I think it was cooling related. Camera was underpowered. Will set up and try again another night
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Old 31-08-2021, 06:52 AM
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Sunfish (Ray)
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I had a lot of problems in NB with pattern noise, particularly without cooling . Dithering and a lower gain helped. I have been using 75 or 100 gain and that helps along with dithering every 5 or 10 frames.
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