Excerpt: It is very sharp , it is very fast , it is very well built and it is one of the least expensive L lenses Canon makes. It is the highly regarded Canon EF 135mm f/2 L USM Lens. If 135mm is the focal length you need, you will not be disappointed by the 135 L.
Excerpt: A telephoto lens, which sports a fast maximum aperture of f/2 and silent focusing with full-time manual focus override and costs around £860. In this review we'll take a close look at how it performs.
Pros: Great build quality, Excellent sharpness, Low CA, Fast f/2 maximum aperture
Cons: Sharpness not as good towards the edges at maximum aperture
Canon EF 135mm f/2 USM L (full format) - Review / Test Report
16 December 2010
Conclusion: The Canon EF 135mm f/2 USM L is a highly desirable lens with excellent performance figures in most aspects. It is very sharp and contrasty straight from f/2 and it's outstanding at f/5.6. The bokeh is exceptionally smooth and buttery at f/2 and f/2.8 although it suffers a bit from bokeh fringing at these large aperture settings. Neither distortions nor lateral CAs are field relevant. The only real weakness is the amount of (visible) vignetting at f/2.
Canon EF 135mm f/2 L USM - Review / Lab Test Report
8 October 2008
Conclusion: 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.