Alley in Pisa, Italy

by Lars Kotthoff

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It's not the size; it's the shape. Specifically, it's the aspect ratio. That's the relative "squareness" of a photo format. For various historical reasons, there are a lot of different ones, and, as you've noticed, they don't line up. See What historic reasons are there for common aspect ratios? if you're interested in exactly why we ended up in this ...



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