The real reason something approximating the diaagonal of the the negative was originally chosen as the normal lens was simply because that was the cheapest lens that would give satisfactory results. All the rest is gobbly-dee-gook made up by photography writer's over the years.
Anders Hultman wrote:
Ok, but why then 50mm and not 43mm? My parents sometimes say when we talk about cameras that "in their times" 45mm was considered normal.
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--graywolf http://graywolfphoto.com
