Details: Product description Focal Length & Maximum Aperture: 35mm f 1.4 Lens Construction: 14 elements in 11 groups Diagonal Angle of View: 63 Degree Focus Adjustment: AF with full-time manual Closest Focusing Distance: 0.92 ft. 0.28m Filter Size: 2.8 in. 72mm diameter Max. Diameter x Length, Weight: 3.2 x 4.2 in., approx. 26.8 oz. 80.4 x 105.5mm, approx. 760g From the Manufacturer: EF 35mm f 1.4L II USMFor brilliant landscapes, portraits and close-up photography, look no further than the EF 35mm f 1.4L II USM. It helps provide a level of clarity and resolving power that can be an ideal complement to the latest generation of Canon s high-resolution SLRs. The EF 35mm f 1.4L II USM has an effective focal length of 35mm on full-frame cameras and 56mm on APS-C cameras, and helps capture beautiful detail with minimal chromatic aberration and color fringing thanks to Canon s new BR optics element*. It also has a fast, 9-blade maximum aperture of f 1.4 for impressive performance in low-light conditions and beautiful, soft backgrounds. And, like other L-series lenses, the EF 35mm f 1.4L II USM has dust and water sealing. Versatile, speedy and elegant, the EF 35mm f 1.4L II USM will delight photographers looking for a bright, sharp and responsive lens for their most important images. Blue Spectrum Refractive Optics Specifications Focal Length & Maximum Aperture: 35mm f 1.4Lens Construction: 14 elements in 11 groups Diagonal Angle of View: 63 Degree Focus Adjustment: AF with full-time manual Closest Focusing Distance: 0.92 ft. 0.28mFilter Size: 2.8 in. 72mm diameter ax. Diameter x Length, Weight: 3.2 x 4.2 in., approx. 26.8 oz. 80.4 x 105.5mm, approx. 760g Sample Image Click here for larger image MTF Chart