Been a long time reader but just started posting. Still have a lot to learn RE Astrophotography. I have an SE6 on an AVX mount, Hyperstar and a new ZWO 183MC. I've read several posts about Gain and Offset and I cannot find anything in Sharpcap regarding Offset settings. Only thing I can see is Gain. Am missing something?
I do not use SharpCap but if it is like other capture programs that support ASCOM, you can change the Offset in the ASCOM driver. The general steps will involve selecting the ASCOM ASI Camera in the camera selection area, then selecting Configure ASCOM Camera. When the ASCOM Driver Options Dialog opens, you can click on "Advanced" and then you will see sliders for setting both Gain and Offset.
I cannot give you exact steps in SharpCap but nearly all programs that support ASCOM will work in the same way.