The Tamron SP 35mm F/1. 4 Di USD (Model F045) aims to deliver perfect images to people who love photography. The exceptional image quality of this fast, fixed-focal lens makes it worthy of being the lens which marks the milestone 40th anniversary of Tamron's SP (Superior performance) Series. All of Tamron's technical competence and new coating technologies have been invested to complete what Tamron call their finest lens ever. Uncompromising resolution at wide-open aperture combines with Tamron's distinctive bokeh and handling characteristics. It also features moisture-resistant construction, a new lenshood locking system and is compatible with the Tamron TAP-in console. Experience the performance for yourself, it promises to give you a better way to see the world. Filter Size: 72mm, Length (from camera mount): 104. 8mm, Max. Diameter: 80. 9mm, Moisture-resistant construction, Maximum aperture: F/1. 4, Minimum aperture F/16, Diaphragm: 9 rounded blades, Lens Construction: 14 elements in 10 groups, Minimum Focus Distance: 0. 3m, Max. Magnification Ratio 1:5, Angle of View (diagonal): 63°26' (with full-frame DSLR)