Sigma 135-400mm F4.5-5.6 APO Aspherical AutoFocus Telephoto Zoom Lens                        

Covering the most frequently used focal lengths, from mid to long-range telephoto, this one convenient lens lets you handle an unprecedented range of subjects from landscapes to fast action sports. Sigma's advanced design incorporates a 5-group zoom system to achieve sharp, high contrast results throughout the entire zoom range. Three SLD glass elements eliminate the secondary spectra effect normally associated with telephotos. And the rear focus system keeps the front lens from rotating, giving you easier use of polarizing filters. A convenient built-in rotary tripod mount eliminates vibration during shutter release.

Specifications
Construction 11 Groups /13 Elements
Angle of view 18.2°-6.2°
F stop range 32-38
Closest Focusing Distance 200-220cm / 78.7-86.6"
Maximum Magnification 1:5.3
Filter Size 77mm
Dimensions (Length x Diameter) 88.5 x 181.1mm / 3.5 x 7.1"
Full Extended Length 266.7mm / 10.5"
Weight 1,210g / 42.7oz.