Sigma 150mm F2.8 EX DG APO AF Telephoto Macro Lens   

This large aperture telephoto macro lens enables you to shoot up to 1:1 life size close-ups. Its large F2.8 aperture makes it an ideal lens for digital SLR as well as film SLR cameras. The new lens power layout provides the ultimate correction against lateral chromatic aberration to which digital cameras are prone.

Two Special Low Dispersion (SLD) glass elements control various color aberrations and assure high image quality.

A floating focusing system moves two different lens groups in the optical system to different positions. This system compensates for astigmatic aberration and spherical aberration.

The HSM models provide ultra quiet high-speed autofocusing as well as full-time manual focus override
Features
World's first High Speed Tele-Macro Lens
Designed to give a superior performance with Digital SLR Cameras as well as 35mm Film Cameras
Super compact and lightweight, large aperture telephoto lens with life-size macro capability
Hyper Sonic Motor (HSM) with full time manual focus override
Floating Focusing System produces excellent optical performance
Detachable Tripod Socket

Specifications
Construction 16 Elements in 12 Groups
Angle of view 16.4°
F stop range 2.8-22
Closest Focusing Distance 38cm (15in.)
Maximum Magnification 1:1
Filter Size 72mm
Dimensions (Length x Diameter) 5.4" (137mm) x 3.1" (79.6mm)
Weight 31.6 ounces / 895gr