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A super wide-angle zoom covering from 15mm ultra-wide angle to 30mm wide-angle It can be useful for images of landscapes, large buildings, group photographs or even more. The perspective that changes with the angle-of-view gives the picture an extraordinary feeling. Please note this lens does not accept a UV filter. Lens Construction 17 Elements in 13 Groups
Angle of View 110.5 - 71.6 degrees
Number of Diaphragm Blades 8 Blades
Minimum Aperture F22
Minimum Focusing Distance 30cm
Maximum Magnification 1:6
Filter Size Rear Type (Gelatin Filter)
Dimensions Diameter 87mm X Length 132.5mm
Weight 620g This is an ultra-wide zoom lens that covers a large wide-angle range from 15 mm to 30 mm. With a minimum focusing distance of 30 cm(11.8 inches) throughout the entire zoom range, it is an ideal lens for Digital SLR Cameras.
Minimum focus distance with 30cm (11.8 in.) at all focal length
Delicate compositions can be adjusted by lens zooming and this is helpful for close-up photography. Provides deep depth of field with its short focal length for amazing photographic expressions.
Aspherical lens for distortion correction
It incorporates hybrid aspherical lens in the front lens group to minimize distortion and astigmatism, and molded glass aspherical lens in the rear lens group to minimize spherical aberration. Minimization of the distortion is a most important issue for zoom lens, but Sigma has succeeded, to provide image quality with minimal distortion by employing aspherical lenses.
Inner focus system
This lens incorporates an internal focusing system, which eliminates front lens rotation. Since focusing do not change its overall length, this lens is easy to hold and use. Also it is allowing the use of a Petal-type Hood.
Handling
The lens also 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.  |
