Description

Sigma 20mm f1.8 EX DG Aspherical RF lens has a Super Multi Coating which reduces flare and ghosting that tends to occur when using digital SLR cameras.

Wide angle lens with large aperture and superior peripheral brightness

This super-wide-angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera.

Minimum focus distance of 20cm (7.9 in.)

The minimum focusing distance of this lens is 20cm (7.9 inch) and it has maximum magnification of 1:4 with fast F 1.8 maximum aperture. The minimum focusing distance of 20cm (7.9 inch) and 94.5¡ angle of view allow close up photography surrounding the photographic subject.

Handling

The lens incorporates Dual-Focus (DF) 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 rear focus system eliminates the need for the front of the lens to rotate, thus allowing the use of a "Petal-type hood", which is superior light blocking effect.

Incorporated aspherical lenses

The use of aspherical lens elements in both of the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.

Detailed specifications of the Sigma 20mm f1.8 EX DG Aspherical RF lens

Lens Construction		13 Elements in 11 Groups
Angle of View		94.5 degrees
Number of Diaphragm Blades		9 Blades
Minimum Aperture		F22
Minimum Focusing Distance		20cm 7.9 in.
Maximum Magnification		1:4
Filter Size		Diameter 82mm
Dimensions		Diameter 88.6mm X Length 89.5mm 3.5 in. X 3.5 in.
Weight		520g 18.3 oz.
Corresponding AF Mounts		SIGMA, CANON, NIKON (D), MINOLTA(D)Mounts, PENTAX

Title	no option