Type M Fine-ground Matte, 5mm spot, Cross Hair, Millimeter Scale. Fine-ground matte field with 5mm clear spot and cross-hair for use in parallax focusing on aerial images. Millimeter scales for calculating magnification of individual objects or for measuring objects. Suitable for close-ups, photomicrography and other high-magnification applications and suitable for use in low light.
Note: Use of camera's metering system is not possible with type M screen