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Last night using a dim M101 I tried different exposures and different Gains. the 600 and 300 s ones were not as good as I thought they would be and the best of the tests turned out to be 120

coming along Ron One thing I would advise is to make your cali frames an odd number. Stops adding unwanted noise.

Coming along fine there ron 👍

13 minutes ago, Graham said:

coming along Ron

One thing I would advise is to make your cali frames an odd number.

Stops adding unwanted noise.

How does that work?

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It just does.

There is a long and scientific reasons for it which is way beyond me , but basically with an odd number you cannot double up a random artifact to create noise as an odd number always cancels it out.

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