When I shoot flats for ASI2600MMP with Optolong 3nm SHO, ASIAIR calculates an exposure for each that produces flats with an average ADU of around 30,000, which is what I understand is desirable. When I shots flats with ASI2600MCP using auto calculated exposure, they invariable come out at average ADU of 38k-40k. Is this a bug, or by design?
