Product Description

Refined Optics As part of the Contemporary line within Sigma's Global Vision series, this lens is designed to achieve a balance between convenience and performance and meshes a compact, lightweight build and versatile handling with notable optical attributes. The lens is constructed with one SLD glass element and one FLD glass element to correct chromatic aberration. It incorporates three high-precision aspherical elements, which reduces the total size and weight of the lens. Fast Closeup Focusing The integrated stepping motor realizes smooth and quiet autofocus. Full-time manual focus control can also be selected via an arc-type auto/manual focus switch. A newly designed linear/non-linear manual focus function is also available. All-Purpose Functionality All-metal body and high-precision metal parts with a dust- and moisture-resistant lens mount for increased protection from the elements. - Sigma 20mm F/2 Dg Dn Contemporary Lens For L - Mount

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