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Micro-Nikkor AF 200mm f/4 D ED - Review / Test Report - Analysis |
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Lens Reviews -
Nikon / Nikkor (APS-C)
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Page 2 of 3
Distortions
The Micro-Nikkor is basically free of distortions.
The chart above has a real-world size of about 120x80cm.
Vignetting
The AF 200mm f/4 is a full frame lens thus enjoying a sweet spot behavior on the D200.
There´s a minor degree of vignetting at f/4 but this is hardly field relevant. From f/5.6
onwards the problem is negligible. Vignetting is no issue at very close focus distances.
MTF (resolution)
In the lab the lens performed excellent without being stellar. Please
note the MTFs charts below represent the performance near infinity focus. For the time being
dedicated macro performance tests are not possible.
At infinity focus it is already no problem to use the lens at f/4 where it achieves very
good resolution figures from edge-to-edge. The sweet spot is reached at f/5.6
with excellent results. From f/8 diffraction takes its toll with a continuously decreasing
quality. However, at f/16 the resolution is still
very good and at f/22 it remains usable. You better avoid f/32 - there´s not much resolution
left here (this is an absolutely normal behavior).
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)
Lateral chromatic aberration (color shadows at harsh contrast transitions) are extremely
well controlled and absolutely negligible. An exceptional but unfortunately also very rare
characteristic.
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