Sigma launches zoom lens with f/1.8 constant aperture

Sigma zoom lens
Sigma's new zoom lens is the world's first to boast an f/1.8 constant aperture

Sigma has introduced an 18-35mm f/1.8 constant aperture zoom lens designed for DSLRs with APS-C sized sensors.

The zoom is the first zoom lens ever to achieve a maximum aperture of f/1.8 throughout its zoom range.

With a focal length range equivalent of 27-52.5mm in 35mm format, the lens has been designed as a standard, everyday or walkaround lens.

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.

Previously, the widest aperture a zoom lens has been capable of achieving is f/2.8, leading many photographers to include at least one prime (fixed length) lens in their kit bag.

To achieve such a wide aperture, Sigma engineers have had to compensate for several complicated problems including distortions and aberrations.

Filter friendly

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.

Amy Davies

Amy has been writing about cameras, photography and associated tech since 2009. Amy was once part of the photography testing team for Future Publishing working across TechRadar, Digital Camera, PhotoPlus, N Photo and Photography Week. For her photography, she has won awards and has been exhibited. She often partakes in unusual projects - including one intense year where she used a different camera every single day. Amy is currently the Features Editor at Amateur Photographer magazine, and in her increasingly little spare time works across a number of high-profile publications including Wired, Stuff, Digital Camera World, Expert Reviews, and just a little off-tangent, PetsRadar.