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Canon 20D Photography Photos San Francisco Sigma 10-20 Street United States Urban

The evolution of back pain

The evolution of back pain

A small poster advertises a survey on back pain. It’s a 3 year programme and since this was taken in 2007 it’s nearing completion now!

Taken somewhere in San Francisco.

Aperture ƒ/4
Camera Canon EOS 20D
Focal length 10mm
ISO 100
Shutter speed 1/160s

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