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Sigma 20mm f/1.8 EX Aspherical DG DF RF AutoFocus Super Wide Angle Lens with Hood for Sigma Cameras - USA Warranty

SKU: SG2018SG MFR: 411110
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About the Sigma 20mm F/1.8

Sigma 20mm f1.8 EX DG Aspherical RF is one of several EX Series lenses. It is the first 20mm Super wide-angle lens in the world with a large aperture of F1.8 and angle of view 94.5°. It has Macro focusing capability with a minimum focusing distance of 20cm/7.9inches (reproduction ratio 1:4). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates an aspherical lens element in the front as well as rear lens groups, to minimize distortion, spherical aberration and astigmatism. The lens has non-vignetting optical construction, in order to obtain adequate peripheral brightness with open aperture. This is especially desirable for digital cameras. The lens incorporates a rear focus system eliminating front lens rotation, thus allowing the use of a Perfect Hood and easy use of polarizing filters. The lens also incorporates dual-focus mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. The lens materials used in this lens are lead and arsenic free ecological glass.

Sigma 20mm F/1.8 Includes

  • Lens Hood, Front & Rear Lens Caps, Pouch Case, 4-Year USA Warranty, 1 Year International Warranty plus 3 Year Sigma U.S.A. Extended Warranty (Total Warranty is 4 Years from Date of Purchase)

Summary of Customer Reviews

Customers most agreed on the following attributes:
Strong construction (7) , Fast / accurate auto-focus (6) , Fast / accurate auto-focus (5) , Strong construction (5) , Durable (4) , Rugged (4) , Rugged (3) , Consistent output (3) , Strong construction (3)
Heavy (4)
Best Uses:
Travel (5) , Night photography (4) , Landscape/scenery (4) , Night photography (3)
Reviewer Profile:
Photo enthusiast (4) , Semi-pro photographer (3) , Photo enthusiast (2) , Semi-professional (2) , Semi-pro photographer (2) , Photo enthusiast (2) , Semi-professional (1) , Professional (1) , Pro photographer (1) , AA shutterbug 30 years (1) , Enthusiast (1) , Semi-professional (1) , Semi-pro photographer (1)

Sigma 20mm F/1.8 Specifications

Construction 11 groups /13 elements
Angle of view 94.5°
F stop range 22
Closest Focusing Distance 20cm / 7.9"
Maximum Magnification 1:4
Filter Size 82mm
Dimensions (Length x Diameter) 88.5 x 87mm / 3.5 x 3.4"
Weight 520g / 18.3oz.
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