![]() It’s like the best of ultrasonic and stepping motor systems rolled into one and, unlike in the previous lens, the focus ring no longer rotates during autofocus. Read our full Sigma 100-400mm f/5-6.3 DG OS HSM | C review for more detailsĪ massive improvement over the original Canon 70-300mm IS USM, this Canon EF 70-300mm f/4-5.6 IS II USM has a much faster Nano USM autofocus system that’s virtually silent, yet gives smooth transitions for video capture. One disappointment, however, is that no optional tripod mounting ring is available for Sigma. In our tests, the Sigma proved marginally less sharp than the competing Tamron 100-400mm but there’s very little in it, and the level of customization is superior. You can also apply custom settings to the new-generation image stabilizer and autofocus system, via Sigma’s optional USB Dock. ![]() As such, you can give priority to either automatic or manual override in dual-mode AF, as well as selecting a purely MF setting. High-quality optics incorporate four SLD (Special Low Dispersion) elements, while up-market features include extremely quick ring-type ultrasonic autofocus with three switchable focus modes. Indeed, the supplied lens hood is specially shaped for this purpose. Slightly smaller and more lightweight than the competing Tamron lens, and much more compact than the Canon, Sigma’s ‘Contemporary’ class 100-400mm zoom nevertheless feels very well built. The zoom and focus rings work with a smooth, fluid feel and you can also operate the zoom mechanism with push-pull action. Read our full Canon EF 100-400mm f/4.5-5.6 L IS II USM review for more details All in all, it’s a better lens than the original edition in every respect. There’s a 4-stop triple-mode image stabilizer and very fast autofocus. The top-class glass includes fluorite and Super UD (Ultra-low Dispersion) elements, along with ASC (Air Sphere Coating) to minimize ghosting and flare, and fluorine coatings on the front and rear elements. However, it still incorporates the adjustable friction damper for the zoom mechanism, as featured on the original lens, which helps to avoid zoom creep. The Mark II edition of the lens ditches the trombone-style push-pull zoom mechanism and adopts a more conventional twist ring. It’s about 50 percent weightier, comes complete with a tripod mounting ring, and has Canon’s typical L-series pro-grade build quality and weather seals. At around twice the price of the Sigma and Tamron 100-400mm lenses on the market, the Canon EF 100-400mm f/4.5-5.6L IS II USM is a more substantial proposition.
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