Canon EF 600mm F/4L IS II USM on Canon EOS 5D Mark III vs Canon EF 500mm F/4L IS II USM on Canon EOS 5D Mark III vs Canon EF 400mm f/2.8L IS II USM on Canon EOS 5D Mark III COMPARISON SELECTION (3 ...

Open photo challenge leaves the choice of subject up to readers — and the results are as diverse as they are stunning.

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