Product Summary
- Model name: Sigma 18-35mm F1.8 DC HSM
- Release Date: Apr. 18, 2013
- Focus Type: Autofocus / Manual
- Format : APS-C / Crop Sensor
- Mounts: Canon | Nikon | Sony | Sigma
- Purchase options: Amazon | B&H
Overview
Sigma announces world’s first F1.8 constant aperture zoom lens the Sigma 18-35mm F1.8 DC HSM Art lens. Means this zoom lens will achieve a maximum aperture F1.8 throughout the entire zoom range. This revolutionary, lens is dedicated for DSLR cameras with APS-C size sensors, which is equal to a focal range of 27-52.5mm on a 35mm camera. Features like minimum focusing distance of 11 inches, and a maximum magnification ratio of 1:4.3, make it an ideal companion for landscapes, portraits, still-life, studio, close-up and Street photography for both enthusiast and professionals.
previously unavailable in zoom lenses, this exceptionally fast apertures will provide photographers with a new level of creativity and convenience, with the outstanding image. Distortions, aberrations and field curvature are technologically and optically challenging for a large aperture wide angle zoom lens. But Sigma has tapped into its long history as a lens pioneer to overcome those issues in this new generation lens by applying wide, glass-molded aspherical lens and the incorporation of Special Low Dispersion (SLD) glass. These technologies, mostly inherited fron the wide angle designs of 12-24mm F4.5-5.6 II DG HSM and our 8-16mm F4.5-5.6 DC HSM, have optimized power distribution of the optical elements and compensated for various aberrations, as well as curvature of field at the widest angle. Additionally, Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high contrast images, even in backlit conditions.
The new Sigma 18-35mm f/1.8 lens is the latest addition to the Sigma’s Art line of lenses, designed under the new Global Vision. The lens incorporates improved AF/MF switch and uses Thermally Stable Composite (TSC) compound material, which helps the lens to performs consistently well at extreme temperatures, and reduces the size and weight. The new lens is compatible with Sigma’s new USB Dock, enabling photographers to update lens firmware and adjust focus parameters from their computers.
The lens features, internal focusing and zooming, which prevents changes to the length of the lens. The front part of the lens does not rotate, so filters like circular polarizers can be used. The supplied petal-type hood will provide extra protection from flare and ghosting. Sigma’s Hyper Sonic Motor (HSM) ensures a silent, high-speed AF function. The new optimized auto focus algorithm results in smooth focusing and full-time manual focusing capability. Lastly, it’s rounded nine-blade aperture diaphragm produces an attractive, round bokeh even at large-aperture settings.
Sigma 18-35mm F1.8 DC HSM Specs
| Lens Construction | 17 elements in 12 groups |
| Minimum aperture | F16 |
| Filter size | φ72㎜ |
| Angle of view (35mm equivalent) | 76.5° – 44.2° |
| Minimum focusing distance | 28cm/11.0in. |
| Dimensions (Diameter x Length) | φ78㎜x 121mm/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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