Sigma has announced a lightweight standard zoom for full-frame mirrorless cameras, the 28-70mm F2.8 DG DN | C. It’s designed to be a smaller and more affordable alternative to the firm’s existing 24-70mm f/2.8, and a direct competitor to the Tamron 28-75mm F/2.8 Di III RXD. Its credentials as a carry-anywhere lens are reinforced by its compact dimensions: at 72.2mm in diameter, 101.5mm in length and 470g in weight, it’s the smallest and lightest in its class.

Sigma’s new 28-70mm f/2.8 mounted on a Sony Alpha 7-series body

Optically the lens is based on the excellent 24-70mm f/2.8, but with the narrower 28mm start-point allowing a more compact design. It’s constructed using 16 elements in 12 groups, including 2 ‘F’ low dispersion (FLD), 3 super-low dispersion (SLD) and 3 aspherical glass elements to suppress optical aberrations. Nine rounded blades are used in the aperture diaphragm, with the aim of delivering attractive bokeh. Sigma has included an O-ring seal around the mount to stop dust or water getting into the camera, but the lens barrel itself isn’t sealed. The front element is treated with a water and oil-repellent coating, and a large AF/MF switch is positioned on one side.

Sigma’s new 28-70mm f/2.8 will form a particularly portable package when used with the Sigma fp

A stepping motor drives a single internal element for rapid, silent autofocus. The minimum focus distance ranges from 19cm at wideangle to 38cm at telephoto, and the lens accepts 67mm filters. It’ll be available in Leica L and Sony E mounts from March 12th, and will cost £759.99.

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