Sigma has announced a new 18-35mm f/1.8 DC HSM lens for DSLR cameras that have APS-C sized sensors.
The new Sigma 18-35mm f/1.8 DC HSM lens. (Source: Sigma.)
Offering a constant f/1.8 aperture across the 18-35mm zoom range, it sets a new standard for the format. The new lens covers angles of view equivalent to 27-52mm in 35mm format and will focus to 28 cm. Its optical design consists of 17 elements in 12 groups with five SLD (Special Low Dispersion) glass and four glass-moulded aspherical lens elements. Nine diaphragm blades close to a circular aperture for attractive bokeh and the new lens should provide the same depth-of-focus isolation as a 24-70mm lens on a ‘full frame’ camera.
The Sigma 18-35mm f/1.8 DC HSM lens is 121 mm long with a diameter of 78 mm and an overall weight of 810 grams. The barrel length remains constant and the front element doesn’t rotate during focusing and zooming. It accepts 72 mm filters and is compatible with the recently-announced Sigma USB Lens Dock. It will be available in Sigma, Canon and Nikon mounts. Release dates and pricing have not been disclosed thus far but MTF graphs and full specifications can be found at http://www.sigma-global.com/en/lenses/cas/product/art/a_18_35_18/index.html.