The Shutter speed and aperture can be coupled togehter (move one and the other moves too) in the "E" if you want, but they are not coupled to the meter. The Shutter speed and aperture are always coupled to the meter (move one or the other and the needle moves) in the "F" but they are never coupled to each other.The serial is 2822100 on the white face. Does this ensure the meter is not coupled? I don't want that.