I've got a 1/3 stop filter compensation to work with. Not all my lenses have aperture stops of 1/3 and shutter speed is only full stops. So to make things easier, when using a handheld light meter, I thought I'd dial in the compensation with ISO on the camera.
I've got 160 speed film. I leave the light meter at 160 ISO and set the ISO dial on the camera to 200 ISO. Is that right?
Wrong. To give 1/3 stop more exposure you need to set to 125 ISO.