This Sigma 120-400mm f/4.5-5.6 DG OS HSM APO Lens is an ultra
telephoto zoom lens ideal for nature/outdoor or sports photography. This
translates into an equivalent range of 192-640mm when used with an Canon digital
SLR camera.
The OS (Optical Stabilizer) system minimizes image blur caused by camera
shake, and offers the equivalent of shooting at a shutter speed 3-4 stops
faster. This allows handheld telephoto zoom shooting even in poorly lit
conditions.
The use of the OS (Optical Stabilizer) system, HSM (Hyper Sonic Motor), APO
apochromatic design, three elements of SLD (Special Low Dispersion)
glass, and multicoated optics all enable this lens to provide a high level of
performance throughout its entire zoom range, as well as versatility. A rear
focus system insures quick, convenient manual focus and a non-rotating front
barrel.
The improved DG lens design corrects for various aberrations. This lens is
specially coated to get the best color balance, while cutting down on ghosting
caused by reflections from the digital image sensor. The lens provides the
utmost correction against lateral chromatic aberration, which is a serious
problem for digital SLR cameras.
By adding the optional Sigma APO teleconverter, you can use this lens as a
168-560mm f/6.3-8 manual focus ultra-telephoto zoom lens with a 1.4X EX
teleconverter, or as a 240-800mm f/9-11 manual focus ultra-telephoto zoom lens
with a 2X teleconverter.
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