This girl was delighted beyond words when the otters at Lafayette’s Colombian Park Zoo decided to make a visit to the glass.    I had my camera at my side but it was mounted with a  70-300 zoom lens.   Any zoom lens will give you a shallow depth of field, especially from up-close.   When I spotted the swimming otters,  I switched to shutter priority at 1/1250 of a second and high-speed continual shooting.    I  stepped back about ten feet, focused on the glass and then turned off the auto-focus switch on the lens.  I then moved the camera forward about 3 inches (to focus just behind the glass) and started shooting.   Despite the thin focal plane,  I managed to capture a number of sharp photos including the one below.