High Magnification Zoom Lens with a
10:1 zoom ratio, from 50mm standard to 500mm ultra telephoto focal length range
with Super Multi Coating which reduces flare and ghosting that tends to occur
when using digital SLR cameras. Optimized optical design for digital SLR
cameras.
For the first time in optical history, this ultra-zoom lens employs a
seven-group zoom system, which provides a high magnification. This system
ensures a superior level of precision from 50mm standard to 500mm ultra focal
length range. In addition, by utilizing triple-cam Rear Focusing System
effectively, high precision is maintained throughout the whole focus length.
Reduces flare and ghost
This new high magnification zoom lens employs a new design concept for
digital SLR cameras. Its new lens power layout produces an excellent optical
performance and also reduces flare and ghost. This new lens is designed to
reduce the influence of harmful light caused by reflections from the digital
image sensor.
It is possible to reach 1000mm focal length by using the Sigma 2X Apo Tele
Converter.
By attaching the 2X APO EX Tele-Converter, this lens can be used as a
200-1000mm/F10.4-12.6 manual focus zoom lens, while maintaining a very compact
size for 1000mm focal length. It is also possible to use AE (Automatic Exposure)
function, when EX Tele-converters are attached.
The APO lens corrects chromatic aberrations.
An apochromatic lens, which keeps color aberration to a minimum, using
Special Low Dispersion (SLD) or Extraordinary Low Dispersion (ELD) glass is
called an APO series lens at Sigma.
This lens uses four pieces of SLD (the special low dispersion) glass for
excellent correction of chromatic aberration. High optic performance is
demonstrated throughout the entire zoom range.
HSM (Hyper Sonic Motor)
The HSM models (the HSM is only available for AF Canon, Nikon and Sigma
Mounts) provide quiet high-speed AF function, as well as full time manual focus
capability.
Easy Operation and Handling
This lens also features a Zoom Lock device to eliminate "Zoom Creep" when
the lens is tilted down. When the lens is set to the 50mm focal length, it is
remarkably compact and provides easy handling. The tripod mount is composed of
magnesium, to minimize total weight and also it is easy to grip and carry the
lens due to ergonomic design of the tripod mount.
Non-rotating front lens elements, due to rear focus mechanism make possible the
use of a custom bayonet "Petal-type Hood", which prevents extraneous light from
degrading the image quality. This mechanism also allows the use of circular
polarizing filters, since the front barrel does not rotate during focusing or
zooming.
