Alley in Pisa, Italy

by Lars Kotthoff

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I know the size of an object in a picture in feet. How can I use this information to tell how far away it is from just looking at a photograph? The object is on a small mountain. I just wan't the general distance to the object. I'm not a math wiz so if you could make it simple for me? I do know of the way you can do this in real life using your thumb at ...

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