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The Sigma 20mm F1.8 EX DG Aspherical Lens is a 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
The minimum focusing distance of this lens is 20cm and it has maximum magnification of 1:4 with fast F 1.8 maximum aperture. The minimum focusing distance of 20cm and 94.5 degree 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.
It can be used with Digital SLR cameras
Digital SLR, that has smaller image sensor size than 35mm film cameras. Therefore, angle of view of 180 cannot be obtained with Digital SLR cameras. However, it uses only the centre part of the frame, therefore, peripheral distortion will be very small. You can shoot as normal ultra wide angle lens.
Maximum aperture: 1.8.
Minimum aperture: 22.
Lens Construction: 11 groups, 13 elements.
Blades in Diaphragm: 9.
Angle of View: 94.5 degrees.
Minimum Focusing Distance: 20cm.
Weight: 520g.
Dimensions (Length x Diameter): 88.6mm x 89.5mm.
Filter size: 82mm.
What's in the box: Lens, Lens Hood, Fitted Padded Case Front and Rear Caps, Instruction Manual, Warranty Card.