Konica Hexanon AR 50mm F1.7 Lens Filter thread: 55 mm Length:earlier version: 45 mm (13/4") later version: 40 mm (11/2"),Weight: earlier version: 240 g (87/16 oz) later version: 210 g (73/8 oz) Angle of view: 46 Closest focussing: earlier version: 0.45 m (1ft 53/4") later version: 0.55 m (1ft 95/8") Aperture: AE / 16