Compact and lightweight: The TTartisan meter is a small, lightweight accessory meter that weighs only 35g, it serves well for people who use older Leica's and similar rangefinder cameras.Shoe-mount design: The meter conveniently slips into the camera's shoe while readings are taken.Two dials: one for ISO and aperture and another one for shutter speed allow settings to be made.LED indicator: A series of LEDs illuminate to tell the user when the correct measurement has been achieved. Mechanical range Limit: Limited by the mechanical range of the dial ligth meter When ISO is 25, the aperture setting with F-number greater than 8.0 is not possible When ISO is 50, the aperture setting with F-number greater than 11 is not possible When ISO is 100, the aperture setting with F-number greater than 16 is not possible
