Express Action Sports

I’m getting into sports photography at the semi-professional level and was wondering if anyone has used the Sigma 300mm f/2.8 lens. The price difference is over $1000 and I’ve heard at times that the Sigma lenses are much better than they were in the past. Anyone’s thoughts or comments?

I actually use that Sigma lens and can tell you that it is great, I shoot with a Nikon but it’s the same lens as it would be for Canon. Obviously if money is no object always go with the same manufacturer of your camera for your lenses but personally I would say this lens is well worth it especially if you need to watch your expenses. I shoot a lot of sports action and have no complaints about the Sigma lens at all.