Stop with the binoculars!!!!

I'm playing this (or trying to) on an Xbox 360 and in the very first level in the graveyard heading towards the church when I run along the weapon keeps switching to the binoculars. Is this supposed to happen? And if not how do you stop it?
I'm staying at a friend's house and playing it on his machine. I dont have a console so dont play games much and its probably something really obvious that I'm doing but it's frustrating as I keep getting killed by nasty Germans whilst I'm switching back to my gun.