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Nikkor AF 105mm f/2 D DC - Review / Test Report - Analysis |
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Lens Reviews -
Nikon / Nikkor (APS-C)
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Page 2 of 3
Distortions
The DC-Nikkor shows an extremely low level of distortions (0.12%) 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 and
it is generally no problem to use this lens even at the max. aperture setting (f/2).
MTF (resolution)
The Nikkor was only tested at the neutral DC setting. The resolution figures
are already very good at f/2 and increase to excellent levels beyond. The
sweet spot is reached around f/5.6.
With activated Defocus Control (other than f=R or F) the corresponding image softening
also affects the resolution and contrast performance to varying degree but by doing so the quality
of the bokeh is of primary interest and less so the sheer resolution.
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 aberrations (color shadows at harsh, in-focus contrast transitions) are
very low at around 0.5px on the average at the image borders.
Typical for many ultra-large aperture lenses the DC-Nikkor suffers a bit from
Longitudinal Chromatic Aberrations (LoCA) resulting in greenish and reddish
out-of-focus edge transitions.
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