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Overall Conclusions

20 May 2016: This page is historical. Reviews over the years trended more and more to field tests, which lead to the conclusion that lab tests should be understood as minor data points.

Objective conclusions must be based on hard scientific data, and to that end some tests have been performed along those lines (eg resolution charts).

But objective tests are only guidelines to understanding performance under real field conditions with 3D subjects. As well, such allegedly objective tests can be objective only with defined parameters, since the choice of test conditions can favor one lens over another (consider testing a macro lens at close distance vs a non-macro lens at close distance).

In-the-field assessments are ultimately much more useful than objective ones, because they can include a greater range of shooting situations as well as experience; performing strict A/B comparisons is extremely difficult to do well, and very restrictive in subject matter (consider rapidly-changing outdoor lighting). Photography is about human visual perception, an inherently difficult-to-quantify phenomenon, and I prefer to make real images, not test shots of resolution charts or buildings. I believe that subjective judgments made with appropriate context offer the potential to be more valuable than ones based on static test setups.

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