Focal Length 35.3mm Aperture f/2 to f/16 Camera Mount Type Leica M Angle of View 63° Smallest Object Field 16.5 x 24.7" / 419 x 627 mm Entrance Pupil 0.4" / 10 mm (position from bayonet flange) Minimum Focus Distance 2.3' / 70 cm Reproduction Ratio 1:17.5 Optical Design 7 elements in 5 groups Diaphragm Blades 11 Focus Manual Filter Thread 39 mm Dimensions 1.4 x 2.1" / 34.5 x 53 mm Weight 9 oz / 255 g