I have recently read on several threads that pro/ex-pro photographers don't use lens caps when carrying their lenses. The reason for this is to change the lenses quicker to get that shot without having to fiddle about with caps, I can understand that. Being a hobbyist photographer, I suppose I baby my lenses by keeping the caps on. The main reason is I don't want dust debris getting onto the glass and damaging the lenses and possibly getting into the camera too. Can any pro/ex-pro expand on this? Are some of us hobbyist being over cautious?