Because Mr. Salgado switched from medium format film to digital black-and-white cameras midway through his eight-year journey, Mr. Taschen and Mrs.

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The small screen format and variable delivery speeds force us to think differently about the medium.

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Sometimes this is about content, in terms of shooting in a different way, perhaps using film rather than digital, or medium format, or just using shorter focal length lenses, and at other times it's more about packaging the story in a different way.

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