|
This great lens combines a 5 lens group zoom
system with an aspherical lens element to deliver sharp high contrast
images throughout the entire zoom range. Using Sigma's unique
apochromatic lens design and three SLD glass elements, the aberrations
usually found in ultra-telephoto lenses have been eliminated. And with
Sigma's new focusing system, the front lens group doesn't rotate, which
makes using polarized filters a snap. A convenient built-in rotary
tripod mount eliminates vibration during shutter release. |
