Hi, I'm just looking to get some general input from users of this lens. From all reviews it seems decent. maybe not 300mm zoom but certainly usable. I shoot on DX and i can't justify spending 2300 on 2.8 70-200 (though i would if i had the cash)! I use mostly my 16-85; 55-200 does not do it for me :0; more to the point, I probably will not do alot of low light shooting. Mostly I'd use it during day for some landscapes, zoo animals, flowers and maybe some day sports. So the questions i have are is the lens 1) relatively sharp at large focal length 2) is autofocus fast enough to keep with kids, animals, birds, i.e well moving subjects 3) how is the contrast and color rendition Thanks in advance for your help!