Canon EF 135mm f/2 L USM - Review / Lab Test Report - Analysis
Lens Reviews -
Canon EOS (APS-C)
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As to be expected from a fix-focal lens the level of distortion is negligible.
The chart above has a real-world size of about 120x80cm.
On the EOS 350D with its reduced format (APS-C) the (full format) lens exhibits a medium
degree of vignetting at f/2 which may be visible at times. Stopping down to f/2.8
reduces the issue to a negligible degree.
In the lab the EF 135mm f/2 USM L exhibited a very even performance on an excellent to
exceptional level throughout the tested aperture range. In fact the lens was able to
break the existing record in center and border resolution within the Canon EOS scope.
The performance peak is reached at f/5.6 where both the center as well as the borders are
easily excellent. It really doesn´t get much better than this.
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)
Similar to most other fix-focal lenses chromatic aberrations (color shadows at harsh contrast transitions)
are low and nothing to worry about.
The Canon EF 135mm f/2 USM L is a superb lens with outstanding performance
figures in all aspects except maybe vignetting at the max. aperture setting (f/2).
The mechanical construction is up to pro standards and the AF is as fast as it gets
in EOS land. All-in-all a lens that truly deserves the Canon L designation.