I shoot a lot of outdoor extreme sports. Fast, close and in low outdoor light, generally cloudy! Under trees or from rocks over water and the ocean! I've been considering a new lens and the Sigma EX 17-35mm F2.8-4 ZOOM came up on my radar while trawling the web!
Am I right (speaking as a semi novice) in saying, I have chosen a fast focusing lens. With a suitable aperture for low light and fast shutter speed shots! Also with wide angle and enough zoom to keep me satisfied!
I've found one second hand at about half the price new!
I guess I'm just a bit nervous buying my first non kit lens! I don't want to go wasting money!
Any experience of this lens and or advice is very much appreciated!
Ohh and I'm shooting with a XSi/450D + BG-E5 grip
Ta 
