Every time I take my RB out and don't take all the lenses, I end up wishing I had the one I left behind. Now I just take em all, 65, 90, 127, 150SF (sharp when stopped down), 180, 250, and 360. I'm hoping to get all this plus everything else that goes with an RB in a backpack this summer to haul around Rocky Mountain Nat. Park...My back hurts thinking about it!