Otus 1.4/55

Focal length: 55mm
Aperture range: f/1.4 f/16
Lens elements/Groups: 12/10
Focusing range: 0.5m (19.68 ") infinite
Free working distance: 0.33m (13.2 ") infinite
Angular field* (diag. / horiz. / vert.): 43.7 degrees/ 36.7 degrees/ 24.9 degrees
Diameter of image field: 43 mm (1.69 ")
Flange focal distance: 44.00 mm (1.73 ")/ 46.5mm (1.83 ")
Coverage at close range (MOD)*: 246 x 163 mm (9.69 x 6.42 ")
Image ratio at MOD: 1:6.8
Filter thread: M77 x 0.75
Entrance pupil position ( in front of image plane): 101mm (3.50 ")
Rotation angle of focusing ring (infMOD): 248 degrees
Diameter max.: 92.4 mm (3.64 ")
Diameter of focusing ring: 83 mm (3.27 ")
Length (without lens caps): 127.3 mm (5.01 ")/ 125.3mm (4.93 ")
Length (with lens caps): 144 mm (5.66 ")/ 141mm (5.55 ")
Weight: 2.43 lbs