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My money is still on what Dave has said. Either fog or dew on some part.
It’s great that you’ve discovered the benifits of gain 100 over gain 0 but just make sure you’re not getting Segwayed away from your original issue. You have said you have used gain 0 for a long time but the noise issue is new. If you are looking on Astrobin and seeing nice clean images on gain 100, make sure you’re also looking at comparable integration times and not comparing a 5hr one night image with a multi night 20hr image. There are many factors as you know that contribute to noise but don’t lose sight of the fact it’s a new issue to you whist using the same settings you have been using.
Ryan
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