The Sigma 28mm F1.8 EX DG Aspherical Macro Lens is a large aperture wide-angle lens for close up photography. This large-aperture wide-angle lens is equipped macro focusing capability with a maximum magnification of 1:2.9 and fast F1.8 maximum aperture. The use of aspherical lenses are offered for superior peripheral brightness and compensation of aberrations and astigmatism. This is an ideal DG lens for Digital SLR cameras.
This lens is capable of Macro photography, with minimum shooting distance of 20cm (reproduction ratio 1 : 2.9) and angle of view is 75.4. You can take picture not only the subject but also the surrounding scenery.
Large front element and Super wide-angle
This lens has an advanced optical construction, in order to obtain adequate peripheral brightness at open aperture. Also, the iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background.
This lens also incorporates a 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. Also this allows the use of a "Petal-type Hood" , which is superior light blocking effect.
It incorporates a floating focus system and uses two aspherical lens elements for minimizing distortion, spherical aberration and astigmatism.
Maximum aperture: 1.8.
Minimum aperture: 22.
Lens Construction: 9 groups, 10 elements.
Blades in Diaphragm: 9.
Angle of View: 75.4 degrees.
Minimum Focusing Distance: 20cm.
Dimensions (Length x Diameter): 83.6mm x 82.5mm.
Filter size: 77mm.
What's in the box: Lens, Lens Hood, Fitted Padded Case Front and Rear Caps, Instruction Manual, Warranty Card.