This is the model with a color-agnar 45mm f2.8 lens; 3 speed + B; and a match needle metering system. On top of the camera there is a disc with a raised edge. Inside this is another disc that turns to select the film speed. The problem is the outer disc also turns so the metering changes without a true indication of the film speed setting. Any suggestions or information where I can find the user manual would be useful.