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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
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.
Please note that the MTF results are not directly comparable across the different systems!
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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