Hi, after some series of test I come to conclude my FM2N is 0.5 stop overexposing. Question: The FM2N allows ISO to be set in thirds but I need halves. What now? Do I just shoot as the normal ISO, get the balance reading in the viewfinder and then underexpose it by a half stop aperture. Can I make it more auto than that? I thought about changing the ISO purposely and just shoot when the viewfinder says 0. But if the ISO selector is not in halves, then I can't right .... If I were to use that I would be 0.2 stop off right? 0.5 mnus 0.2. Thanks.