When I am shooting at a wedding or engagement session I carry 2 bodies, 1 has a fast 50, the other a zoom. When I need to break out the wide I switch out the zoom for a wide and put away the zoom without caps. Then when I am ready to switch back I can do so extremely easily and quickly. Caps just get in the way. If you are shooting on a job you should be worried about the shots and not the gear in my opinion. That's just my $0.02.