I am looking at buying a vortex viper 15-45x65 my biggest concern is how good will this scope be for field judging? I drew a really exclusive deer tag and a pretty good bull tag. I think it will do fine on the elk hunt but, I am just curious on how far out you think a guy could effectively field judge a mule deer buck with 15-45x65 spotting scope. I am in college and don't have a ton of money to blow I am trying to stay under $800 which I know is not a lot.