I picked up a Sony a6000 camera and also a zoom lens for it. I'm trying to learn how to use it, but not very familiar with it at all right now. It seems like every time I go to use the camera the lens will be completely extended/zoomed in. I actually have to use the lock on the side to keep it from extending. I was taking some pictures tonight and it kept wanting to zoom in without me twisting it. It's a SEL18200, I thought these don't have power zoom, thought that was SELP18200. It's very likely I'm just doing something stupid, but what am I doing wrong?