The Voigtlander Nokton 50mm f/1.1 is a super high speed lens for Leica M mount cameras. Superbly built, the lens weighs a mere 15oz and features an all-metal lens barrel construction. The lens construction of the lens employs 7 elements in 6 groups and 10-blade aperture. It has a manual focus ring and a dedicated aperture ring. The aperture ring clicks in half f-stop increments with the minimum aperture of f/16. Delivering 1 meter minimum focusing and accepts 58mm screw-in type filters.