Voigtländer 15mm Optical Finde for fitting in LEICA rangefinder cameras. Because of the super wide focal length, the field of view with this lens is far too wide for standard rangefinders to display properly. As a result, you need an external, shoe-mounted optical finder in order to see what kind of area the lens covers. If shooting on a digital rangefinder, you can always use the Live View option, of course. The frame-lines when shooting with a rangefinder (analogical rangefinder Leicas) do not match up of course, given the nature of how they operate, but the field of view cannot be displayed through the camera’s built in optical viewfinder. So this is the reason for a separate shoe mounted optical finder. Check my other auction for the superb Voigtländer Heliar 15mm lens. Weight: 0,032 Kg, Size: 3 x 3 x 3cm . Shipping is EURO20,00 to any European Union country, EURO10,00 to continental Portugal and EURO30,00 to any other country.