Sigma 20mm F1.8 EX DG Aspherical

The Sigma 20mm F1.8 EX DG Aspherical is a lens with the amazing minimum focusing distance. The Sigma 20mm is an ideal lens optimized Digital SLR camera.

The Sigma 20mm F1.8 EX DG is a super wide angle lens with large aperture and superior peripheral brightness. The Sigma 20mm features Super Multi Coating that reduces flare and ghosting that tends to occur when using digital SLR cameras.

The Sigma 20mm F1.8 EX DG is a very unique lens. With the Sigma 20mm lens you can literally get right into-the-face of the subject you're shooting. With a wide angle focal length and a wide aperture, you can get some cool looking close-up shots - and you get dramatic background blur too! Sharpness isn't everything - this Sigma 20mm lens lets you get certain shots that you can't get otherwise (low light wide angle shots, close-up wide angle shots, etc.).

Minimum focus distance
The minimum focusing distance of this Sigma 20mm F1.8 EX DG 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 Sigma 20mm F1.8 EX DG 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.

see the Sigma 20mm F1.8 EX DG and full rage here