"Perhaps unsurprisingly, the Zeiss Apo Sonnar achieves a very high DxOMark lens score of 40 points, and achieves an equally extraordinary 28P-Mpix Sharpness score on the 36-Mpix D800. Not only is it pin sharp at full aperture from corner to corner, sharpness levels at f2.8 are similar to those at f5.6 on rival offerings. Chromatic aberration is also extremely low, as you might expect with a lens boasting four anomalous partial dispersion glass elements and an Apo moniker from a firm such as Zeiss. Distortion is low though it’s not really likely to be high on a lens like this. Vignetting is similarly low while transmission is still very good at 2.4 T-Stops."
