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Tokina AF 100mm f/2.8 AT-X Pro D macro - 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 100mm f/2.8 AT-X Pro D shows extremely low distortion (0.07%) 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.
The lens remains perfectly usable in this respect even at max. aperture (f/2.8).
MTF (resolution)
The AF 100mm f/2.8 AT-X Pro D was capable to show excellent resolution results in the
lab straight from f/2.8 till about f/11 both in the center as well as the borders.
Beyond diffraction is the limiting factor but this is a physical constraint and not a lens issue.
As you can notice in the MTF chart below you should avoid very small aperture settings.
An excellent performance but this is typical for most macro lenses out there.
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)
Tokina lenses tends to suffer from higher than average chromatic aberrations (color shadows
at harsh contrast transitions) and for a fix-focal the numbers are indeed relatively high peaking
beyond 1px on the average at the image borders. Please note that the issue can be corrected without
any significant impacts via tools.
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