Nikkor AF 85mm f/1.8 D - Review / Test Report - Analysis
Lens Reviews - Nikon / Nikkor (APS-C)

Distortion

The AF 85mm f/1.8 D shows extremely low distortion (0.03%) which is absolutely negligible in field conditions.

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

Vignetting

Thanks to the sweet spot behavior on the D200 vignetting is very well controlled. Surprisingly for such a large aperture lens this is also true for the max. aperture setting (f/1.8) with a relative light loss of a mere 0.4EV which is generally irrelevant. From f/2.8 and up the problem is only detectable under lab conditions.

MTF (resolution)

The AF 85mm f/1.8 D was able to show exceptional resolution figures in the lab. The center resolution is already excellent straight from the max. aperture setting with the borders following quite closely. The sweet spot is reached around f/5.6 where the lens scratches the resolution limits of the D200.

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 extremely low even for a fix focal lens.




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