Unfortunately there are disadvantages and pitfalls, which are rarely mentioned or even recognized, and lenses may be hailed or dismissed for the wrong reasons. This method, which is popular among photo magazines and some enthusiasts on the internet, uses dedicated test charts and analysis software. However, such a system is not within reach of individuals and a new method has emerged with the advent of digital cameras. ![]() For decades, the preferred measurement device has been the scanning-slit optical bench. A more realistic performance indicator is measured MTF. The MTF can be computed theoretically for known lens designs, but there are always implementation losses and the actual performance of a production lens falls short of the theoretical ideal. An explanation of MTF is beyond the scope of this article, but excellent texts are available elsewhere. The de facto industry standard to quantify lens performance is the modulation transfer function (MTF).
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