Offset seems to be quite mysterious to most people, and for good reason. I suggest you start with that and then follow up with this. This post aims to explain offset and its relationship to gain as well as how to determine just what is a good offset setting to operate a camera at.įirst, if you are completely and utterly unfamiliar with the concept of sensor gain and offset, Jon Minnick of Cloud Break Optics (Seattle’s finest astronomy superstore) wrote a very good article on gain and offset as part of a multi-part series on astrophotography. But gain often has a far less familiar companion called offset that, to many, appears to be related to gain in some fashion but how it works and its exact relationship to gain is mysterious and not very obvious. One might think of sensor gain (or on DSLRs, ISO) as one of the most prominent and critical controls for a camera of any sort, and rightly so given what it does.
Astronomy cameras, especially CMOS-based ones, bristle with features and different controls and all affect the image data that they produce in some way or another.
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