andrew schank , May 14, 2002; 02:26 p.m.
Because the meter is not coupled to the camera, You need to tell the meter what the maximum f stop of the lens you are using on it is, and will need to change that every time you change to a lens with a different maximum F stop. Then you turn the thing on and rotate the dial until the corect LED lights up. Then you have to take the readings and transfer them to the lens and shutter dial-not a very fast system.. Be sure to check it against another meter-mine was off by 3 stops but wasn't too hard to adjust. (set screws on the rotating nob).