My photo tour group visited the Perito Moreno glacier today in Patagonia, and I was hoping to see some calving but it was not to be. So this is a shot I took the last time I was here. The glacier is under tremendous pressure, and that plus the warming temperatures of spring and summer cause large chunks of ice to break off and fall into the lake. The columns of ice can be anywhere from 200 to 400 feet high. The sound of the crash is amazing, and the monstrous splash makes a great picture if you are fast enough to capture it. My estimation is that all of the action happens within about 2 seconds. My settings for this shot were 1/500, f/8, and 400 ISO, and I used a 100-500mm Canon telephoto.
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