Photo credit Erica Knox Photography. On our recent trip to Yellowstone one of my fellow photographers observed that it seemed that good things happened (i.e. wildlife appeared or did something interesting) right after I changed my camera lens. They were right. After a while it became a rallying cry when things were slow: "Ed it's time for you to Change Lenses". I learned to keep lenses on both camera bodies so I was caught less often changing to the "wrong" lens. Want to see what happened after I changed lenses here? Coming soon.