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Upgrading its previous DC series telephoto lens this week, Sigma is releasing the APO 50-150mm f/2.8 EX DC OS HSM telephoto lens in Canon’s EF mount, with Nikon and Sigma mount versions to follow in early May. The upgrade includes the addition of Sigma’s proprietary Optical Stabilizer technology, which allows shutter speeds approximately four stops slower than would be otherwise possible, assuring confidence in close-up, handheld photography. The lens is designed exclusively for smaller-chip, APS-C-sized DSLRs, and as such cannot be used on full-frame digital or film cameras, for vignetting will occur.
The minimum focusing distance of the lens is 31.5 inches and maximum magnification is 1:6.3. The aperture ranges from f/22 to a large maximum f/2.8. A circular, nine-bladed diaphragm achieves effective bokeh, affording desirable portrait, landscape and nature photography.
Less than 8 inches in length, the DC OS can be paired with the Sigma 18-50mm to make up a complementary and compact two-lens solution.
The DC OS incorporates an inner focusing and inner zooming system meaning the overall length of the lens doesn’t change during focusing and zooming, thus ensuring convenient handling and further qualifying the lens as an advantageous tool for handheld tele-photography. Inner focusing also eliminates front-lens rotation, perfectly suiting the DC OS for the adaptation of circular polarizing filters.
Six special low dispersion glass elements serve to correct exceptionally for chromatic aberration and to deliver high image quality across the entire zoom range. The DC OS in total has 21 lens elements in 15 groups.
A Hyper Sonic Motor maintains quiet and high-speed autofocusing while allowing manual override at all times. A Super Multi-Layer Coating reduces flare and ghosting and ensures sharp and high contrast across the entire zoom range up to maximum aperture, even in backlit conditions.
The DC OS comes with a lens case, a hood and a tripod socket. Optionally, one of Sigma’s two APO teleconverters—the 1.4x EX DG or the 2x EX DG—can be attached to convert the DC OS into a 70-210mm f/4 or 100-300mm f/5.6 autofocus telephoto zoom lens, respectively.
|Lens Construction||21 elements in 15 groups - 6 SLD glass elements|
|Angle of View (for SD1)||31.3 - 11.1°|
|Number of Diaphragm Blades||9 (rounded diaphragm)|
|Minimum Focusing Distance||31.5" (80 cm)|
|Filter Size||77mm diameter|
|Lens Hood||Petal-type hood|
|Accessories Supplied||Lens case, hood, tripod socket|
|Dimensions (W x L)||3.4 × 7.77" (86.4mm × 197.6mm)|
|Weight||2.95 lb (1.3 kg)|
|These specs are for Sigma mount only. Nikon F and Canon EF specs have not yet been provided.|
*Vignetting will occur if the lens is used with image sensors larger than APS-C size or 35mm SLR and APS Film SLR camera