Mamiya 55mm f/2.8 Wide Angle Auto Focus Lens for 645AF

The 55mm f/2.8 is the most popular wide angle focal length in 645 format. It renders natural perspective with increased depth of field and angular coverage and provides the least amount of distortion of the wide angle range for subjects at the edges of the frame.

Applications include group portraits, wedding photography, and general purpose wide angle photography.
Specifications
Construction 6 Groups/ 8 Elements
Angle of view 65°
F stop range f/2.8-22
Closest Focusing Distance 1' 5.7" / 45cm
Maximum Magnification 1:9
Filter Size 58mm
Dimensions (Length x Diameter) 2.3 x 2.8" / 59.4 x 70mm
Weight 11 oz. / 305 g.