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Non-Tech : Iomega Thread without Iomega
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To: John Solder who wrote (9417)4/26/1999 9:52:00 AM
From: Jeff Sheeran   of 10072
 
John, I believe that depth of field is also related to focal length. For example a 28mm lens has a much greater depth of field when focused at 10 ft then a 90mm lens. Depth of field is a function of f stop which is a ratio of iris diameter compared to focal length. This is why an f2.8 lens of a 300mm focal length is much larger then one of a standard 50mm lens. Digital only refers to the "capture" of the image, the optics and principals behind them would be the same. You are not exposing film, you are exposing a ccd. Since the "capture" area on a digital is much smaller than on a standard 35mm camera you do no need as long of a focal length to get corner to corner coverage. I believe that standard focal length on a digital camera is somewhere around 25mm? you would have much more depth of field. This is why the Minox spy camera was so effective, it had incredible depth of field with a very short focal length. Take a pinhole camera for example you get focus from near to far, not very sharp but still a focus.

Regards,
Jeff
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