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Nikkor AF 85mm f/1.8 D - Review / Test Report - Analysis |
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Lens Reviews -
Nikon / Nikkor (APS-C)
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Page 2 of 3
Distortions
The AF 85mm f/1.8 D shows extremely low distortions (0.03%) which are 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 in line widths
per picture height (LW/PH) which can be taken as a measure for sharpness.
The chart is limited to the visually relevant LW/PH range of [750, 2250].
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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