A great sharp wideangle for 39mm screwmount cameras from Voigtlander, Leica and Canon. With the attached focus assiter you go from minimum distance to infinity in less than ninety degrees of rotation. Apertures are selected with the click-stop diaphragm. A standard L-mount is used for this lens, making it compatible with Voigtlander Bessa R & L cameras as well as classic cameras from Leica and Canon with the venerable 39mm screwmount design. If you desire to use this lens with Leica M, Voigtlander Bessa T or Konica Hexar RF cameras, use the adapter ring (catalog number 45BD205A).