New MTF-based calibration allows testing higher resolutions
Traditionally, MTF testing using paper targets assumes that both the printing on the target and the paper used for the target are perfect and present an ideal black-white edge with infinite resolution. Unfortunately, ink or photographic edges are never perfect and paper always has some of its own texture, with the result that MTF for cameras and lenses measured this way is not accurate. In DxO Analyzer v6 we have analyzed our test targets to measure the MTF of the target itself. Analyzer then corrects the results of its MTF tests using this correction factor as a calibration, so that the results more accurately reflect the MTF of the device being tested. This additional accuracy is particularly important as sensor resolutions continue to increase.
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