Im looking to buy a new lens for my Canon AE-1 Program. I have been looking at two different ones right nwo but i am looking for sugestions on others. Right now I have found a Tokina 60-300mm or a Tokina 300-500mm. The purpose of the lens is for taking pictures of wildlife on my property and sporting events. How far of a shot can I make with a 300mm lens? Please help.