I photographed these flamingos in Walvis Bay, Namibia. They were just outside the hotel my photo tour group was using. I used a 400mm focal length (on a Canon 100-400mm telephoto), and my settings were 1/60, f/5.6, and 400 ISO. This shutter speed is too slow for a telephoto lens, but at the time I was still using a Canon 7D Mark II. This camera has way too much noise, and ISO settings above 1000 produce disappointing images. That's why I kept the ISO low, but that in turn forced the shutter to be dangerously slow. The picture turned out to be sharp, but I was lucky the birds weren't moving fast. The general rule for shutter speeds versus long lenses is the shutter should be the reciprocal of the focal length. In other words, if you are using a 400mm focal length, the shutter should be 1/400th or faster to insure sharp pictures.
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