Canon EF 100-400mm f/4.5-5.6 USM L IS - Review / Test Report - Analysis
Lens Reviews -
Canon EOS (APS-C)
Page 2 of 3
Distortions are very well controlled with this lens.
At 100mm there're virtually undetectable barrel distortions switching to slight
pincushion distortions from 200mm and up. The effect is usually not field-relevant.
Move the mouse cursor over the focal length text marks below to observe the respective distortions
The chart above has a real-world size of about 120x80cm.
Thanks to the sweet spot effect the EF 100-400mm f/4.5-5.6 USM L IS showed only
marginal vignetting on the EOS 350D. In the field this should be pretty much
MTF (resolution & chromatic aberrations)
Two lenses have been tested - the first one showed a rather mediocre quality
whereas the second one (its results are shown below) performed pretty much
according to the "consensus".
The lens exhibits a very even performance throughout the zoom range. At 100mm
the resolution figures are very good straight from f/4.5 and increase to
excellent results by f/8. Unsurprisingly there's a slight decrease in performance
towards 400mm where the quality is still on a very good level.
Chromatic Aberrations (CAs)
The EF 100-400mm f/4.5-5.6 USM L IS shows only marginal lateral CAs which
are generally not field relevant. Purple fringing doesn't seem to be a
Flare can be a problem with this lens so using the supplied hood or some other kind
of protection is a good idea (the hood of the EF 24-70mm L fits as well, BTW).
Strong light sources within the image will usually
produce some ghostings and a reduction of contrast - a complex design with several
lens elements has limits here.
Due to the small max. aperture the out-of-focus blur is quite underdeveloped when facing small object magnifications.
Nonetheless you can achieve a small depth-of-field using a long focal length in conjunction with a close object distance.
The quality of the achievable bokeh is quite decent.