Look here my first test shots with my new Sigma optics !
This Sigma lens is their first optic with optical stabilizer !
AND YES optical stabization works great. hmmm No it works extremelly great
and SUPER GLASS optics.
It blows away my Canon 70-200 f4L !
All shots is shot handhold, and most of them in wind 7-10 m / Sec.
Judge for your selves
YES all great ! but i admit focus is slow compared to USM / HSM
http://www.olsen-web.dk/photo/firstsig/index.html
Claus Olsen