Sigma 18-35mm f/1.8: first-ever zoom lens with f/1.8 constant aperture unveiled

    By | News | 18/04/2013 11:36am
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    The Sigma 18-35mm f/1.8 DC HSM announced today is the first ever zoom lens to achieve a wide constant aperture of f/1.8 throughout the zoom range. Find out all the key specs of this new Sigma lens.

    A Sigma 18-35mm f/1.8 price and release date were not available at the time of writing.

    Sigma 18-35mm f/1.8: first-ever zoom lens with wide constant aperture unveiled

    Sigma has revealed a new 18-35mm zoom lens with a constant aperture of f/1.8.

    The new Sigma 18-35mm f/1.8 DC HSM is the first ever zoom lens to achieve a maximum aperture of f/1.8 throughout the zoom range, according to Sigma.

    The previous widest aperture a zoom lens has been able to achieve throughout the zoom range has been f/2.8 – which is a full stop and a third slower.

    Designed for DX-type DSLRs with APS-C size sensors, the Sigma 18-35mm f/1.8 offers a focal range equivalent to 27-52.5mm in 35mm format. It is the latest lens in Sigma’s A or Art range – which specialises in fast-aperture optics.

    Sigma says the new 18-35mm lens has been designed as a standard lens which is capable of shooting landscapes, portraits, still life photography, even studio photography. It will be particularly welcome by reportage photographers who need to shoot in lowlight and who will appreciate the bokeh effects that can be achieved with the wide maximum aperture.

    The ground-breaking maximum aperture means that DX camera users can now get the same restricted depth of field as using an f/2.8 aperture setting with a full-frame FX SLR (as the smaller the sensor, the more depth of field you get).

    The faster aperture throughout the zoom range will eliminate the need for photographers to keep fixed focal length lenses in their camera bags for brighter images, Sigma says. The lens weighs 810g.

    The new Sigma 18-35mm lens also incorporates a wide glass-moulded aspheric lens and Special Low Dispersion glass, the latter which compensates for various aberrations as well as field curvature at the widest angle.

    The Sigma 18-35mm f/1.8 also features Super Multi-Layer Coating to reduce flare and ghosting, and boost contrast, while a supplied petal type hood provides extra protection.

    A Hyper Sonic Motor provides a silent AF function, Sigma says, while the 18-35mm f/1.8 offers a minimum focusing distance of 28cm and a maximum magnification ratio of 1:4.3.

    Other features include a 9-blade rounded diaphragm, brass bayonet mount and a newly developed USB Dock that plugs into your computer and attaches to your lens, allowing you to update the lens firmware and adjust parameters such as focus.

    Sigma 18-35mm f/1.8 Key Specifications

    Lens Construction: 17 elements in 12 groups | Minimum aperture: F16 | Filter size: ø72mm | Angle of view (SD1): 76.5°-44.2° | Minimum focusing distance: 28cm/11.0in. | Dimensions (Diameter x Length): ø78mm x 121.0mm/3.1in. x 4.8in. | Number of diaphragm blades: 9 (Rounded diaphragm) | Maximum magnification ratio: 1:4.3 | Weight: 810g/28.6oz

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    Posted on Thursday, April 18th, 2013 at 11:36 am under News. You can subscribe to comments.

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