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Sigma

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Item Includes Description Features Specifications

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

Mfr. Part: 411109     SKU: SG2018PXAF

Sigma 20mm f/1.8 EX Aspherical DG DF RF AutoFocus Super Wide Angle Lens with Hood for Pentax AF Cameras
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Item Includes
Lens Hood, Front & Rear Lens Caps, Pouch Case, 4-Year USA Warranty, 1-Year International Warranty

Description
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.

Specifications
Construction11 groups /13 elements
Angle of view94.5°
F stop range22
Closest Focusing Distance20cm / 7.9"
Maximum Magnification1:4
Filter Size82mm
Dimensions (Length x Diameter)88.5 x 87mm / 3.5 x 3.4"
Weight520g / 18.3oz.
  
 
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