Sigma has announced today a new telephoto lens that will definitely woo many SLR users. The new Sigma 50-150mm f2.8 APO DC is a fast f2.8 telephoto zoom lens that weighs just 27.2oz (770g). That is almost half of the weight of current f2.8 telephoto zoom offerings (such as Sigma’s very own 70-200mm f2.8 DG, Canon’s 70-200mm f2.8 IS/non-IS and Nikon’s 70-200mm VR).

And with a 35mm equivalent of 75 to 225 mm, it could make for a pretty fine portrait lens.

• Focal length: 50 – 150 mm
• Maximum aperture: f2.8 (throughout the zoom range)
• Minimum aperture: f22
• Lens constructions: 18 Elements in 14 groups
• Angle of view: 27.9° – 9.5°
• Number of diaphragm blades: 9 pieces
• Minimum focusing distance: 1 m (3.3 ft)
• Maximum magnification: 1:5.3
• Filter size: 67 mm
• Lens hood: Bayonet type
• Dimensions: 76 mm x 135 mm (3.0 x 5.3 in)
• Weight: 770 g (1.7 lb)
• For digital SLR cameras with an APS-C size image sensor
• HSM (Hyper Sonic Motor) system ensures quiet and high-speed auto focusing with full time manual focus override.

But of course, I would suggest waiting for sample images before committing your hard-earned cash.