Sigma 17-40mm f/1.8 DC Art Lens (Sony E / Fujifilm X / Canon RF)

APS-C | f/1.8 to f/16 25.5 to 60mm (Full-Frame Equivalent) Superfast Wide-to-Normal Zoom HLA Autofocus 11" Minimum Focus Distance Control Ring SLD and Aspherical Elements Water- and Oil-Repellent Coating Dust & Splash Resistant Construction A Bright, Wide-to-Normal APS-C Zoom Sigma introduces a new zoom lens for APS-C mirrorless cameras with an f/1.8 aperture throughout the entire zoom range, the 17-40mm f/1.8 DC Art Lens. Featuring prime-like optical performance and video-friendly design and functionality, its wide-to-normal focal range means a lighter kit bag without surrendering image quality. Design and Performance The lens features a total of 17 elements in 11 groups, with four aspherical and four Special Low Dispersion elements to minimize flare and ghosting and suppress various aberrations. This results in an optical performance that meets or exceeds that of other Sigma Art lenses, including the 18-35mm f/1.8 DC HSM Art lens. Along with its 11-blade, rounded diaphragm, the design promotes sharpness and a large, smooth bokeh when used wide open.In addition to the f/1.8 maximum aperture, the lens also maintains an 11" minimum focusing distance across the entire zoom range. It achieves a maximum magnification ratio of 1:4.8 at its longest focal length, increasing depth of field and versatility in tight spaces. Items Included Sigma 17-40mm f/1.8 DC Art Lens (Canon RF) Sigma LCF-67 IV Lens Cap (67mm) Sigma LCR III Rear Lens Cap for Canon RF Lens Hood Carrying Pouch