Hello All. I am a rank amatuer and this is my first post on the forum. It is for a relatively mundane question. I have a Nikon D90 with a Sigma 28-300 lens. When I am carrying the camera around using the regular Nikon strap, the lens creeps all the way out. It just doesn't seem like a good thing for the lens to be that loose. Is there some device or way of "locking" the lens so it doesn't extend from just carrying it around? Thanks for any help.