Canon EF 35-350mm f/3.5-5.6 USM L - Review / Test Report - Analysis
Lens Reviews -
Canon EOS (APS-C)
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Normally you would expect rather extreme distortion from a 10x
zoom but the issue is actually pretty well controlled. At 35mm
the lens shows quite strong but not excessive barrel distortion.
At 50mm the EF 35-350mm is basically
distortion-free before changing to slight pincushion distortion
at the other tested focal lengths.
As usual you should probably expect more distortions towards closer focus distances.
The EF 35-350mm f/3.5-5.6 USM L is a full frame lens so it can take advantage
of a sweet spot effect on APS-C DSLRs and it shows - vignetting is basically
no important issue with this lens. At 350mm the issue is a little more
pronounced at f/5.6 but at only EV 0.6 it shouldn´t be visible except
in very critical scenes.
Naturally a 10x zoom comes at cost of a bigger compromise compared
to more conventional zoom lenses. However, the EF 35-350mm L solved
this ambitious task pretty well.
Throughout the entire range the center performance is very good
sometimes even peaking in excellent results at medium aperture settings.
At the borders the story is a little more complicated. At 50mm and more
so at 350mm the border results are soft but increasing rapidly when
stopping down. At the other tested focal lengths the quality is
quite decent even at max. aperture.
It is worth to notice that the sample suffered from a slight
centering problem in the medium zoom range.
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 (color shadows at harsh contrast transitions) are a
weak spot at the wide end of the focal length range. At 35mm
the average CA pixel width exceeds 1.6 pixels at the most extreme setting
(f/5.6). At 50mm the problem remains quite pronounced but beyond CAs
are no big issue anymore.
Due to network bandwidth limitations I can't provide any sample images at this stage.
Despite its ambitious zoom range the Canon EF 35-350mm f/3.5-5.6 USM L
is capable to deliver very decent results throughout the zoom range. Naturally
there´re some flaws here and there (border quality) but it all remains
within acceptable limits. Unlike the Sigma 18-200mm f/3.5-6.3 DC it
also proved to deliver good results under field conditions where it
was a joy to use with its very good build quality and fast and reliable
AF. It is also and maybe even especially interesting for APS-C DSLR
users who want to limit their bunch of lenses. Combined with an
ultra-wide zoom this lens can complete a decent ultra long range setup
(without a large aperture option though).