MTF (Modulation Transfer Function) describes how well a lens can reproduce fine details, measured as the degree of contrast achieved between finely spaced lines..
[1] Contrast (%) [2] Distance from optical center of lens (mm) [3] Max. aperture [4] F8 aperture [5] Spatial frequency [6] 10 lines pairs / mm [7] 30 line pairs / mm [8] Radial values [9] Tangential values