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LensRentals.com - "This lens is soft" and other myths -
2010-02-18 18:21:22 GMT
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Simple and valuable explanation of focus problems with shallow-depth lenses (f2 and below I think): combination of calibration tolerances of the body and the lens (both properly calibrated) can produce out-of-spec result. High-end bodies have a tune-up feature for this.
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