This is an axis deer I captured while on a boat in Chitwan National Park, Nepal. I used the 500mm focal length on my 100-500mm Canon zoom plus a 1.4x teleconverter. This gave me 700mm. With that kind of magnification, and especially since I was in a moving boat, the shutter had to be fast enough to mitigate the magnified movement so the pictures would be tack sharp. My settings were 1/800, f/9, and 2000 ISO. As I've written before, the rule for shutter speeds with telephoto lenses is the shutter should be the reciprocal of the focal length, or faster. In other words, with a 700mm lens the shutter speed should be 1/700 or faster to guarantee sharp images.
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