I've just purchased the D600 and now looking for a good telephoto lens. I am looking at taking sports shots, mainly go karts and other sports. I would like a good range with it. I have just seen the Sigma 150-500mm lens, just wondering is this a good lens or is there a better lens to buy around the same price range. I am done a little research, I am just a little weary of getting it. I do have a Tamron 70-300mm lens, which I want to upgrade to a better lens.
I am also wondering what other lenses are worth looking at having in my kit. I have a 50mm prime lens and a Tonkia 16-28mm wide angle lens.
I will mainly by shooting Real Estate Photography, but I am not limiting myself just to doing that.
Any help would great appreciated please.