Features: The Leica Summarit-M series covers the full spectrum of classic rangefinder photography. The lenses are, of course, 6-bit encoded for optimized use with the Leica M digital cameras and true to the Leica tradition, they are designed to reveal their full potential with all M cameras from the Leica M3 onwards. The Summarit-M maximum aperture of f/2.5 and the concentration on classical and proven spherical lens designs leads to very compact, but high performance lenses with excellent quality expected from a Leica lens. All Summarit-M lenses are shipped in velour pouches, with metal lens caps for the front and back. In addition high-quality solid metal sun hoods are available as accessories. Specifications: Number of Aperature Blades 11 Minimum Distance 35.43 inches (0.9 m) Filter Size E46 Lens Mount M Made In Germany Yes 6-bit Coding Yes Length 2.38 inches (60.5 mm) Diameter 2.17 inches (55 mm) Weight 12.2 oz (345 g)