This is the optically stabilized version of the NON stabilized version of this lens!!! Ie. The Sigma 70-300 DG zoom ! Sorry for the confusion but I have just spent 7 hours inputting stuff to the website and am now more than slightly bored!!
Just buy it! You know you want it! Don't bother asking the wife, God Know how much she spends on shoes! You deserve this lens. No Stuff it Go for the Sigma 150-500 OS That's a fabulous lens and if you're going to get into trouble with the wife it may as well be in for a penny as in for a pound!

This telephoto zoom lens incorporates Sigma’s original OS (Optical Stabilizer) function and is housed in acompact construction. The OS function offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. It makes telephoto shooting easy for many types of photography such as sport and nature.

The Super Multi-Layer Coating reduces flare and ghosting and provides high contrast images throughout the focal range. The lens has an overall length of 126.5mm (5.0 inch), maximum diameter of 76.5mm (3.0 inch) and weight of just 610g.

Its compact construction makes it convenient for travel and hand held telephoto photography. This lens has a minimum focusing distance of 150cm (59.1 inch) throughout the entire zoom range and a maximum magnification ratio of 1:3.9, making it ideal for close-up photography.

Specifications -

Lens Construction - 16 Elements in 11 Groups
Angle of View - 34.3 degrees - 8.2 degrees
Number of Diaphragm Blades - 9 Blades (rounded diaphragm)
Minimum Aperture - F22
Minimum Focusing Distance - 150cm /59.1 in
Maximum Magnification - 1:3.9
Filter Size - Diameter 62mm
Lens Hood - Bayonet type
Dimensions - Diameter 76.5mm x Length 126.5mm3.0 in. x 5.0 in.
Weight - 610g
Corresponding AF Mounts - SIGMA AF, CANON AF, NIKON AF, SONY AF, PENTAX AF