Hi Wayne. I have a D300 and use a Sigma 120-400mm for all my sport and wildlife shots. I can't fault this lens which I bought new 2 years ago, and the results are very impressive. The APSC sensor in my camera means the focal length of all lenses is multiplied by 1.5, so this lens equates to a 180-600mm. So if you want a damn good lens with some grab I would recommend this Sigma for your D90. All the best, Mike.
Originally Posted by waYne73
Humility is an endearing quality and gains many friends, whereas arrogance loses them. Mike, 2012