Nikkor AF 28mm f/1.4 D - Review / Lab Test Report - Analysis
Lens Reviews -
Nikon / Nikkor (APS-C)
Wednesday, 26 December 2007 07:57
Page 2 of 2
The AF 28mm f/1.4D exhibits only a slight degree of barrel distortion (0.8%).
The chart above has a real-world size of about 120x80cm.
The AF 28mm f/1.4D is a full frame lens thus enjoying a sweet spot advantage
on APS-C DSLRs. Despite its ultra-large aperture the vignetting is still
moderate at f/1.4. From f/2 onwards the problem is basically negligible.
Unfortunately the Nikkor showed a rather pronounced centering defect (this is a 100% center crop)
which spoiled the MTF results quite a bit specifically at large aperture
settings. Typical for such
defects it helps to stop down and from f/2.8 onwards
the results are very impressive with an extremely high center performance
and very good borders. A fully valid sample should perform even better.
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
Chromatic Aberrations (CAs)
Chromatic aberrations (color shadows at harsh contrast transitions) are relatively
well controlled for a wide-angle lens. At around 1px on the average the problem
can be visible but it's usually no critical issue (and a correctable one anyway).
Regarding the obvious centering defect it is difficult to find a verdict for
the Nikkor AF 28mm f/1.4D. Assuming a valid sample the performance should be
great when stopped down a little. Even in its less than perfect state the
tested sample performed better than the AF 28mm f/2.8. CAs, vignetting and
distortions are very well controlled for a lens in this class. The build
quality is superb. It is a pity that the lens has been discontinued - more so
because Nikon does not offer any replacement nor any other ultra-fast wide-angle
fix-focal AF lens.
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