Well, with a manual focus SLR, an infra-red filter, some fast film, and a small aperture setting, you could easily get around this. Just use some simple geometry to guesstimate the distance between the camera and the target. Setting the f-stop to a higher number gives you a larger margin of error in your focus, so the likelihood of getting a clear shot increases.
Slashdot Mirror
Well, with a manual focus SLR, an infra-red filter, some fast film, and a small aperture setting, you could easily get around this. Just use some simple geometry to guesstimate the distance between the camera and the target. Setting the f-stop to a higher number gives you a larger margin of error in your focus, so the likelihood of getting a clear shot increases.
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http://www.axis.com/us/index.htm