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The SIGMA
18-50mm f/2.8-4.5 DC OS Large aperture standard zoom lens, designed exclusively for digital SLR cameras and incorporating Sigma's original OS (Optical Stabilizer) function.
This lens offers a large aperture of F2.8 at the 18mm focal length
making it ideal for indoor photography and in low lighting conditions.
Two SLD (Special Low Dispersion) glass elements and three aspherical
lenses provide excellent correction for all types of aberrations. High
image quality is assured throughout the entire zoom range.
The
incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high speed
AF. The Super Multi-Layer Coating reduces flare and ghosting and
provides high contrast images.
This lens has a minimum focusing
distance of 30cm (11.8 inches) throughout the entire zoom range and a
maximum magnification ratio of 1:4.1 making it ideal for close-up
photography. |
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Features
- Superior image quality throughout the entire zoom range
Two SLD (Special Low Dispersion) glass elements and three aspherical
lenses provide excellent correction for all type of aberrations. High
image quality is assured throughout the entire zoon range.
- A bright image through the viewfinder
This lens offers a large aperture of F2.8 at the 18mm focal length.
This large aperture provides a bright image through the viewfinder and
enables photographers to easily check focusing and composition. The
near circular diaphragm creates an attractive to the out-of-focus areas
which enables photographers to emphasize the subject.
- Sigma’s own unique OS (Optical Stabilizer) technology
This lens is equipped with Sigma's own unique OS
(Optical Stabilizer) function. This system allows the photographer to
use shutter speeds approximately 4 stops slower than would otherwise be
possible whilst still eliminating camera shake. For Sony and Pentax
mounts, the built-in OS function of this lens can be used even if the
camera body is equipped with an anti-shake function. As compensation
for camera shake is visible in the view finder, the photographer can
easily check for accurate focus and ensure there is no subject movement.
* It is not possible to use the built-in OS function of this lens, when using with Pentax ist* series and K100D DSLR cameras.
- Quiet and fast AF
An inner focusing system and HSM (Hyper Sonic Motor) ensure a quiet and high speed auto focus.*
* AF will not function with Pentax ist* series and K100D DSLR cameras that do not support HSM.
- High contrast images
The Super Multi-Layer Coating reduces flare and ghosting and provides high contrast images throughout the zoom range.
- Convenient handling
The lens design incorporates internal focusing and zooming systems,
therefore the overall length of the lens does not change during
focusing and zooming, ensuring convenient handling. The inner focusing
also eliminates front lens rotation, making the lens particularly
suitable for use with circular polarizing filters and the supplied
petal-type hood.
- Minimum focusing distance of 30cm (11.8") throughout the entire zoon range
A minimum focusing distance of 30cm (11.8") throughout the entire zoom
range and maximum magnification ratio of 1:4.1 makes this lens ideal
for close-up photography.
* Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
* It is not possible to use the built-in OS function and AF of this lens with Pentax ist *series and the K100D.
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