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ZWO ASI1600mm - Offset


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This website article explains the question you have asked



Just for reference with a dedicated astro camera I leave the offset at the default value, as stated in the driver, which in the case of all my current ZWO cameras happens to be 8. I used to have an ASI1600 but cannot remember what the default is with that one.

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Basically it's a bad idea to use 0 adu as your zero point because all measurements are subject to noise and uncertainty, signals close to zero could be clipped to zero. That randomly loses information for faint detail. The camera applies a fixed value (the offset) to all values read to minimise this. 

I'll worry about offset when my LP is zero😉

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