Lens type: XF 18mm F/2 R Lens construction: 8 elements in 7 groups (includes 2 aspherical elements) Focal length: (35mm format equivalent) f=18mm (27mm) Angle of view: 76.5Deg. Max. aperture: F/2.0 Min. aperture: F16 Number of blades: 7 (rounded diaphragm opening) Stop size: 1/3 EV (19 stops) Focus range: 18cm - Infinity Max. magnification: 0.14x Compatibility: Fujifilm X-Pro1 camera Filter size: 52mm (2") (Diameter) External dimensions: 64.5mm x 40.6mm (Diameter) / 2.54 x 1.60 inches Weight: 116g (4.0 oz) (excluding caps and hoods)