Modulation transfer functions (MTF) T of a very good lens at various digital zoom factors (1 x, 2 x, 4 x and 8 x) taking into account the contrast sensitivity function (CSF) of the human eye over the spatial frequency R in line pairs per picture height (LP / BH). Without digital zoom the lens has a modulation transfer which is significantly above the requirements of a human observer. At two times digital zoom, the contrasts for the human observer are almost without restrictions, at four times digital zoom, there are already significant losses, and eight times digital zoom, the contrasts are dramatically reduced.