I am considering choice of two lenses for my sports photography the 120-400 or the 150-500 Sigma, I will predominantly be shooting Junior AFL , Cricket and Surfing . I have read a few forums and realize that neither will be as sharp as a prime or the more expensive Canon equivalent zoom. My other concern is speed of AF, as AFL is fast moving and requires lots of tracking with a zoom. I was also wondering if the extra reach in the 150-500 would be better than the shorter 120- 400 even though I have read the latter has a slightly better image quality. Has anyone one compared both and come up with any conclusions ?
Regards First time poster Couta