Canon EF 100-400 mm f/4.5-5.6L IS II USM focus is slow in low light

The Canon EF 100-400L f4.5-5.6 L IS ii is a lens that was a long time coming. It’s predecessor, the original push-pull EF 100-400L f4.5-5.6 IS, was on the market for more than 14 years, and it was certainly a successful seller. In my line of work, leading photographic safaris, I have probably seen more nature photographers traveling with that lens, than any other.

Although the original lens combined a strong set of features, the steady improvements in Canon lenses over the years meant that the original 100-400L was being outperformed by a number of other Canon L-series lenses including most recently the EF 70-300L IS. Canon completely redesigned the new 100-400L f4.5-5.6 IS ii, even though the main specifications of focal length and maximum aperture appear similar. Released worldwide in December 2014, the new EF 100-400L f4.5-5.6 IS ii is well equipped to be an able successor to the lens it replaces. At the time of writing this review, I have already been using my copy of the new lens heavily for more than six months and am confident that I have a good idea of what this lens can do.

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