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Product Information for "Sigma 28mm f1.8 DG Macro Aspherical" »
Manufacturer's product description
This lens is capable of Macro photography- with minimum shooting distance of 20cm (7.8 inch) (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. The lens has an advanced optical construction- in order to obtain adequate peripheral brightness with open aperture. Also- the iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. The lens 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 also allows the use of a Petal-type Hood and the easy use of a polarizing filter. It incorporates a floating focus system and uses two aspherical lens elements for minimizing distortion- aberration and astigmatism.