Sigma 18-200 mm lens

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Sigma 18-200The Sigma 18-200 mm f/3.5-6.3 DC MACRO OS HSM is an updated version of this popular lens. It includes Sigma’s optical stabilization (OS) function and delivers the equivalent of 27-300 mm focal range, with macro.

The lens is the latest addition to the company’s Contemporary line.

By incorporating double-sided aspherical lens elements and downsizing the motor, Sigma has reduced the diameter of this lens by 4.6 mm compared to the previous version.

This lens incorporates Special Low Dispersion (SLD) glass elements that have a high refractive index to effectively correct chromatic aberration at the telephoto end. Aspherical lens elements, including double-sided aspherical lenses, ensure a compact size and excellent correction of distortion. This also helps to produce superior rendering performance throughout the entire zoom range from wide-angle to telephoto and macro photography, says the company.

Advanced optical design and Sigma’s Super Multi-Layer Coating reduces flare and ghosting and provides sharp, high-contrast images, even in backlit conditions. A supplied petal-type lens hood provides extra protection from flare and ghosting.

Minimum focusing distance is 39 cm with a maximum magnification ratio of 1:3.

The lens incorporates Thermally Stable Composite (TSC) material, which has the same level of thermal shrinkage as aluminum and it has low elasticity, even with extreme temperature changes. Since thermal shrinkage is low, it has a high affinity to metal parts, which ensures precision in the lens construction. It also results in slimmer mechanical parts, such as the zoom and scale rings, Sigma explains.

Sigma’s optical stabilizer (OS) system is said to offer superior stabilization, making it possible to compensate effectively for camera shake, even in macro photography. The OS function is not incorporated in the Pentax and Sony versions.

The lens has a 7-blade rounded diaphragm, and the Hyper Sonic Motor (HSM) ensures quiet, high-speed autofocusing. An enhanced AF algorithm is said to deliver smoother autofocusing.

For improved handling, the design of the lens hood, lens cap, and AF/MF changeover switch have been updated.

This lens is eligible for Sigma’s Mount Conversion Service, a paid service that lets you change the mount to use the lens on a different camera body. For program details, visit http://www.SigmaCanada.ca.

The Sigma 18-200 mm f/3.5-6.3 DC MACRO OS HSM lens has a suggested retail price of $499.95 and will be available for Canon, Nikon and Sigma in April; Pentax and Sony versions will follow later this year.

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