Hi everyone,

I am in the middle of upgrading my kit and was hoping for some advice on the new sigma 120-300 2.8 OS in terms of its image quality and autofocus, or any general tips. I think I am leaning toward having a 300 zoom because of what I like shooting - sport, wildlife, landscape, outdoors sort of stuff. I have read good things on the digital picture and 'fro knows photo' about the sigma but was hoping someone who owns the lens could make a comment.

I know the canon 70-300 IS L seems to be very fast at focusing and has very clean image quality albeit not as clean as canon 70-200 range. The only thing the 70-300 lacks is that 2.8 aperture. The only other option is to get a canon 70-200 2.8 IS L with a 1.4 extender but not sure if that bumps the image quality down to sigmas standards, and that would be shooting at f4 as well.

Just any comments would be very valued.

Just ordered the Tamron 17-50 2.8 NON VC and own a Canon 100mm 2.8 L Macro and Samyang 35 1.4. Still waiting on a Hellios 44-2 from russia
:$. APS-C sensor camera.