I am pretty new still to the photography with something other than a point and shoot. I recently bought a nikon d80. What would be a good lens to buy for it to use for outdoor photography. I like to walk through tow woods and try to snap nature pics. Today I came across a couple otters playing a beaverdam pond on our land. The lens I had just did not seem to do a good job, or maybe it was just me :-( Anyways any input would be appreciated.