Having struggled on many occasions to explain the difference between cameras sensors the size of a full frame of 35mm film and the vastly more common smaller sensors, I thought I'd point readers toward this lucid explanation of one aspect by Canon tech guru Chuck Westfall in his October column with the Digital Journalist. One reason you might want to pay attention: the vast majority of digital SLRs use smaller sensors than film SLRs, though Canon and Nikon have some high-end exceptions.
Westfall details in his article how depth of field changes in relation to sensor size. I'm drawing attention to the issue as an excuse to explain why a common practice in the camera business raises my hackles.
Stephen Shankland
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