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Coming off the heels of an exciting year of lens announcements from Sigma, they have started 2014 with two more notable lens announcements as part of the Art and Contemporary lines of their Global Vision structure: the 50mm f/1.4 DG HSM and the 18-200mm f/3.5-6.3 DC Macro OS HSM.
Editor's Note: this post was written by Bjorn Petersen
The new 50mm f/1.4 DG HSM is the first normal prime in Sigma's Art line of lenses, and as such features a redesigned optical layout containing three SLD elements and one aspherical element, for working with full-frame, high-resolution image sensors. The large f/1.4 maximum aperture is ideal for use in low light, and, when coupled with the normal focal length, is well suited to producing shallow depth of field and selective-focus imagery. In addition to the Hyper Sonic Motor (HSM), an updated autofocus algorithm and floating focus system further reinforce the "reëngineered and redesigned" path Sigma is taking with this lens, and serve to produce more fluid focusing control with reduced overall lens movement for greater consistency.
The other newly announced lens is the 18-200mm f/3.5-6.3 DC Macro OS HSM lens, which falls into their Contemporary line of lenses and is designed specifically for use on APS-C-sized image sensors. Compared to previous iterations of this everyday zoom, the new version strives to be lighter and smaller due to its use of Thermally Stable Composite material. Newly integrated Special Low Dispersion glass, as well as aspheric lens elements, helps to maintain high image quality and bolster the improved minimum focusing distance of 15.4" with a reproduction ratio of 1:3. An Optical Stabilizer system helps to compensate for camera shake in the Canon, Nikon, and Sigma versions of this lens, while all mount types incorporate Sigma's HSM autofocus motor for quick, accurate focusing performance.
Both lenses are available in Canon EF, Nikon F, Sigma SA, and Sony A mounts, with the 18-200mm also available in the Pentax K mount. Additionally, both are compatible with Sigma's USB Dock for adjusting lens focus settings, as well as for updating lens firmware, and are also eligible for the Mount Conversion Service.