well thats kind of my point, i use the real world pictures of from my current lens' and then compare using the ratings, i dont really KNOW what a blur unit is, but im looking comparably, i know that at around 4 blur units my pictures are unacceptably soft, when i looked at how many blur units my lens had at a set aperture/focal length combo, but i do now particularily have the time to browse flickr looking for pictures taken with 1 specific lens, unless there is some faster way that i dont know about.
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Sony A330 w/ 18-55mm F/3.5-5.6 and 75-300mm F/4.5-5.6
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