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Category Archives: Technical Discussions

Sigma 24-35mm f/2 DG HSM Art MTF Curves and Sample Variation

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For years now, I've been telling people to always take the results of tests done on one copy of a lens with a serious grain of salt. Not matter how carefully it was tested, it's still just one copy. Others will be worse. Others will be better. Because I'm so aware of copy variation, I [...]

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