Voigtlander APO-Lanthar 180mm f/4 SL - Review / Test Report - Analysis
Lens Reviews - Nikon / Nikkor (APS-C)

Distortion

As to be expected from a moderate tele lens the level of distortion is very low (very slight pincushion distortion) and not field relevant.

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

Vignetting

On the Nikon D200 with its reduced format (APS-C) the (full format) lens exhibits only slight vignetting at f/4 which shouldn't be problem in the field. At f/5.6 the issue is absolutely negligible.

MTF (resolution)

The 180mm APO-Lanthar exhibited an excellent performance from f/4 up to f/8. Beyond diffraction effects are the limiting factor but it remains easily usable till about f/16. The lens showed a very even performance 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)

Low lateral CAs (color shadows at harsh contrast transitions) seem to be one of the primary design objectives of Voigtlander lenses. At less than 0.5px on the average at the image borders the issue is not really field relevant.

Purple fringing is absolutely absent with the Voigtlander - see this sample shot at f/4.




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