Product Description
   
Ultra wide angle zoom lens compatible with digital SLR cameras with 35mm full
frame image sensor.
This ultra wide angle zoom lens incorporates the latest optical design provides
superior performance. FLD ("F" Low Dispersion) glass elements, which have
performance equal to fluorite, and SLD (Special Low Dispersion) glass elements
provide excellent correction of color aberration. Aspherical lenses give
advanced performance with a compact and lightweight construction. The Super
Multi-Layer Coating reduces flare and ghosting. High image quality is assured
throughout the entire zoom range. Incorporation of HSM ensures quiet and high
speed autofocus as well as full-time manual focus capability. This lens has
superior peripheral brightness and provides sharp and high contrast images even
at the maximum apertures.
Ultra wide angle zoom lens compatible with digital SLR cameras with a 35mm
full frame image sensor.
Sigma designed and produced the first wide-angle zoom lens, the "zoom gamma
21-35mm F3.5-4", in 1979. Sigma has since introduced a number of wide angle zoom
lenses. The SIGMA 12-24mm F4.5-5.6 II DG HSM is the successor of the SIGMA
12-24mm F4.5-5.6 EX DG ASPHERICAL / HSM which was launched in November 2003.
This ultra wide angle zoom lens is ideal for digital SLRs with a 35mm full frame
image sensor and incorporates the latest optical design.
Superior image quality
The ultra wide angle zoom lens is possible due to large diameter of the front
lens. Four FLD ("F" Low Dispersion) glass elements, which have performance equal
to fluorite, and one SLD (Special Low Dispersion) glass element provide
excellent correction of color aberration. Three glass mold elements and one
hybrid aspherical compensate for all types of aberration and ensure high optical
performance.Super Multi-Layer Coating
Due to the ultra wide angle, the front of this lens is very large. Sigma's Super
Multi-Layer Coating reduces flare and ghosting which could otherwise create
problems when extraneous light hits the lens' front element. It also provides
sharp and high contrast images throughout the entire zoom range.
Superior peripheral brightness
The design of front lens group minimizes light fall off and increases peripheral
brightness.
Exaggerated perspective
The wide-angle of view produces striking images with exaggerated
perspective, enabling photographers to emphasize the subject.
Compact construction
Incorporation of four aspherical lenses provides a compact construction with a
diameter of 85mm (3.3), overall length of 120.2mm (4.7") and weight of 670g
(23.6oz.). The compact construction makes this lens ideal for travel
photography.
Quiet and high speed autofocus
Incorporation of HSM (Hyper Sonic Motor) ensures quiet and high speed autofocus,
while allowing full-time manual focus override.
Inner focusing system
This lens incorporates an inner focusing system, which eliminates front lens
rotation which also minimizes fluctuation of aberration caused by the focusing
system.
Petal-type hood
This lens is equipped with a Petal-type hood to block out extraneous light and
reduce internal reflections.
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