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This telephoto zoom lens provides a large F4 aperture at all focal lengths.
With minimal light-fall-off, superior peripheral brightness is ensured.
It’s the ideal lens for digital SLR cameras.
This lens uses two pieces of SLD glass elements in the front lens group
and another two in the rear group for excellent correction of chromatic
aberration. High optic performance is demonstrated throughout the entire
zoom range.
The AF drive for Sigma SA, Canon and Nikon cameras is equipped with a
silent, responsive and high speed HSM (Hyper Sonic Motor), which also
provides full-time manual focus function.
This lens incorporates an internal focusing system, which eliminates front
lens rotation, allowing the use of a Petal-type Hood and more convenient
to use of circular polarizing filter. Since focusing and zooming do not
change its overall length, this lens is easy to hold and use.
The use of an Apochromatic design and 4 SLD (The Special Low Dispersion)
glass elements (two SLD glass elements are utilized in the front lens
group and two in the rear group) provide for full correction of chromatic
aberration and a high level of optical performance.
High-speed focusing is possible when this lens is used with dedicated
APO EX tele-converters (1.4x and 2x). With the optional APO tele-converter
1.4x EX, it works as AF zoom lens from 140mm to 420mm F5.6. With APO tele-converter
2.0x EX, it works as a manual focus zoom lens from 200mm to 600mm F8.
It is possible to use AE (Automatic Exposure) function, even EX Tele-converters
are attached to the lens.
