Zeiss Vario-Sonnar T* 70-300mm f/4-5.6 (Contax N to Canon EF) - Review / Test Report - Analysis
Lens Reviews - Canon EOS (APS-C)

Distortion

The level of distortion is very low throughout the zoom range and not field-relevant.

Move the mouse cursor over the focal length text marks below to observe the respective distortion
70mm 200mm 300mm

The chart above has a real-world size of about 120x80cm.

Vignetting

The Zeiss is a full format lens and it shows only a very low degree of vignetting (< 0.5EV) at wide-open aperture (APS-C DSLR). This is usually negligible under field conditions.

MTF (resolution)

The MTF characteristic of the Zeiss lens is a bit of a mixed bag. At 70mm the resolution is on a very high level but the quality decreases continuously towards longer focal lengths. At 200mm the resolution is still very good but there're a more pronounced drop at 300mm @ f/5.6 specifically at the image borders (rather soft). At f/8 and f/11 the quality recovers to very good levels across the frame.

Below is a simplified summary of the formal findings. The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations

Chromatic Aberrations (CAs)

Chromatic aberrations (color shadows at harsh contrast transitions) are generally moderate with an average CA pixel width between 0.3-1px at the image borders. The tested sample showed a slightly uneven CA distribution.




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