MTF (Modulation Transfer Function) describes how well a lens can reproduce fine details, measured as the degree of contrast achieved between finely spaced lines.
 At 12mm / Max. aperture  At 12mm / F8 aperture
 At 24mm / Max. aperture  At 24mm / F8 aperture
 Contrast (%)  Distance from optical centre of lens (mm)
 Spatial frequency  10 lines pairs / mm  30 line pairs / mm
 Radial values  Tangential values