Description
Sigma 18-35mm F1.8 DC HSM The Sigma 18-35mm F1.8 DC HSM Art lens is the world’s first constant F1.8 zoom. Designed specifically for SLRs with APS-C sized sensors, it covers a 28-50mm equivalent range, and is initially available in Canon, Nikon and Sigma mounts with Sony and Pentax versions to follow. The 18-35mm offers the depth-of-field equivalent of a constant F2.7 on full-frame, and allows the use of lower ISO settings in low light. The lens uses Sigma’s Hypersonic Motor for fast, silent focusing, and is compatible with the Sigma USB dock for fine-tuning autofocus calibration. Optically it’s one of the finest zooms we’ve seen. Principal specifications Lens type Zoom lens Max Format size APS-C / DX Focal length 18–35 mm Image stabilisation No Lens mount Canon EF, Nikon F (DX), Pentax KAF, Sony/Minolta Alpha, Sigma SA Bayonet Aperture Maximum aperture F1.8 Minimum aperture F16.0 Number of diaphragm blades 9 Aperture notes Rounded diaphragm Optics Elements 17 Groups 12 Special elements / coatings 5 SLD glass elements, 4 glassmold aspherical elements Focus Minimum focus 0.28 m (11.02″) Maximum magnification 0.23× Autofocus Yes Motor type Ring-type ultrasonic Full time manual Yes Focus method Internal Distance scale Yes DoF scale No Physical Weight 810 g (1.79 lb) Diameter 78 mm (3.07″) Length 121 mm (4.76″) Zoom method Rotary (internal) Filter thread 72 mm Hood supplied Yes Hood product code LH780-03
