Specifications

DIGITAL SLRs
SIGMA
218
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AF LENSES for Canon, Nikon, Sony/Minolta, Pentax & Sigma
Aspherical Lenses
The aspherical lens complex allows freedom of design, improved
performance, a reduced number of component lenses and a compact
size. This lens provides high optical performance while maintaining a
compact size. For example, the 12-24 mm F4.5-5.6 EX DG ASPHERICAL
lens widens the range of wide-angle lenses, and it provides distortion-free
images with image reproduction performance equivalent to that of a
single focal length lens. Aspherical lenses allow the production of high-
quality images from compact, lightweight telephoto zoom lenses.
APO Lens
In order to attain the highest quality images, the APO lens has been made
using special low-dispersion (SLD) glass and is designed to minimize
color aberration. Sigma's APO zoom lenses minimize color aberration.
As the refractive index of glass depends on the wavelength of light,
color aberration occurs when different colors form images at different
points. This problem often occurs with telephoto lenses, but the Special
Low-Dispersion (SLD) glass and Extraordinary Low Dispersion (ELD)
used in Sigma's APO lenses helps to compensate for color aberration,
thereby allowing them to produce of sharp images.
APO Teleconverter EX
This lens can be used with the APO Teleconverter EX. It can increase
the focal length and will interface with the camera's AE (automatic
exposure) function.
EX Lens
The exterior of this lens is EX-finished to denote the superior build and
optical quality, and to enhance its appearance.
Hyper-Sonic Motor
This lens uses a motor driven by ultrasonic waves to provide a quiet,
highspeed AF.
Inner Focus
To ensure stability in focusing, this lens moves the inner lens group or
groups without changing the lens’ physical length.
OS (Optical Stabilizer) Function
This function dramatically expands photographic possibilities by
alleviating camera movement when shooting by hand held camera.
The OS (Optical Stabilizer) function uses two sensors inside the lens to
detect both vertical and horizontal movement of the camera. It then
moves an optical image stabilizing lens group, to effectively compensate
for camera shake. The system has two optical stabilizer modes. Mode 1
determines camera shake in vertical and horizontal panning and
compensates for image blurring. It is therefore effective for taking
general photography or for shooting landscapes and other static
subjects. Mode 2 detects vertical camera shake and compensates for
blurring. It is effective for panning the camera to photograph moving
subjects such as motor sports.
Sigma Advanced Lens Technology
Sigma has refined optical technology, in order to fully realize the possibilities of single lens reflex cameras and to respond ex-
actly to the demands of the photographer, helping him to bring his vision to reality. Sigma’s huge choice of lenses enables photo
enthusiasts to maximize their creativity. Each and every Sigma lens offers optimum optical performance and smooth handling
characteristics through a combination of experience and advanced technology. Sigma’s design and precision engineering helps
photographers to maximize their true creativity by fulfilling the full potential of their cameras.
MACRO LENSES
50mm f2.8 EX DG Macro
To maintain high optical performance from infinity to close-up 1:1 macro photos without accessories,
the Sigma 50mm f/2.8 EX DG incorporates a “Floating Internal Focusing” (FIF) system. As a result,
the lens also features a non-rotating front lens group which makes it easier to work with polarizing
filters, and has a focus limiter to narrow down the broad focus range. Plus, the improved minimum
aperture of f/45 provides improved depth of field. This lens is designed as a high-quality primary
macro lens, good for film or digital SLR cameras. The improved DG lens design corrects for various
aberrations. This macro lens is specially coated to get the best color balance while cutting down on
ghosting caused by reflections from the digital image sensor. Filter Size: 55mm.
For Canon (SI5028MDGCAF) ...................................................269.00 For Nikon (SI5028MDGNAF)....................................................269.00
For Sony/Minolta
(SI5028MDGMAF)...269.00 For Sigma (SI5028MDGSA) ...............269.00 For Pentax (SI5028MDGPAF)............269.00