What type of lens have you used for wildlife and what is your opinion on it? Would a 300mm lens be a good length or should I go higher? I'll most likely be doing bigger animals so something the size of a deer or a large dog. Edit: I am thinking of buying the DX NIKKOR18-300mm f/3.5-6.3G for my Nikon D5100 I am not willing to spend more than 1,000 before tax.