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MTF Curves and Lens Performance

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MTF Curves and Lens Performance

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This curve provides a variety of information. The first thing to note is that the black diffraction-limited line indicates that the maximum theoretical contrast achievable is almost 70% at the 150 frequency and that no modification to this lens design can make the lens perform better (assuming constant f/# and wavelength). Also important are the blue, green, and red lines which correspond to how this lens performs across the sensor (see The Modulation Transfer Function to see which field positions corresponding to each color). It is shown clearly that, at lower and higher frequencies, contrast reproduction is not the same across the entire sensor, thus, not the same over the FOV.

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