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The World’s first f/1.8 Constant Aperture from Sigma

Sigma has release an 18-35mm f/1.8 constant aperture zoom lens designed for DSLRs with APS-C sized sensors. And the new zoom lens is the world’s first zoom len to achieve a maximum aperture of f/1.8 throughout its zoom range.

The new lens fits into Sigma's range of "Art" lenses, which are designed to offer the photographer the most creativity, such as wide apertures. This lens incorporates a wide glass-moulded aspheric lens and Special Low Dispersion glass. Internal focusing and zooming is included, meaning you can use a filter on the front of the lens as it does not rotate.

Other features of the lens include special Super Multi-Layer Coating to reduce flare and ghosting and a minimum focusing distance of 28cm. A hypersonic motor is included for fast and quiet autofocusing. A 9-blade rounded diaphragm is designed to render out of focus areas attractive.

The lens has a brass made bayonet mount, and is compatible with Sigma's USB Dock for optimising lenses. It will be made in Japan.

The Sigma 18-35mm f/1.8 DC HSM price is yet to be confirmed, as is the availability date.

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The World’s first f/1.8 Constant Aperture from Sigma