A special reference mode is very useful when evaluating the light reflected from differant areas in the image, or when monitoring changes in the lighting conditions.
The 2.5x enlarged image covers the entire focusing screen including the viewfinder's built-in LCD. The large eyepiece, specially suitable for users with glasses, can be adjusted from -2 to +1 diopters. The PME45 is powered by a 3V lithium type CR-2 battery.