Ok i am in need of a lense to shoot monster park next weekend, i know enough that my lense is too slow and i need to get the f stop around a 2.8 to get the crisp shots i want. What do you think of this lense on ebay, will it work with a digi or only film. And im assuming it has little to know zoom? HELP! I know this post is bad quality but i might buy this before the auction is over...