The Canon EF 100-400mm F/4.5-5.6L IS USM Lens incorporates an improved optical stabilizer, which is essential when using the maximum focal length with moving subjects. This feature helps users achieve sharp images by shooting at a slow speed.
The lens also has a Canon’s ring Ultrasonic Autofocus Motor (USM) that enables users to achieve a fast and silent focus. Something that we have verified places this excellent telephoto lens on par with others, such as the 200-400mm that we have already analyzed.
It is a versatile telephoto lens with a maximum aperture of f/4.5 at 100mm, making it an ideal lens for portraits.
The ultrasonic motor offers all the benefits photographers can expect in a high-performance telephoto lens. It works very efficiently, quickly, and quietly.
In all other scenarios, autofocus works fine, and even in testing an element in the foreground and slightly varying the frame, it nails the focus in both cases.
The blur it offers is very smooth, with a very nice and gradual bokeh, even when shooting at 400mm, where users can get brilliant results.
And as for the sharpness, it is astonishing. Canon has put it on par with its most prestigious telephoto lenses, and magnificent results are achieved in this regard, even at its maximum aperture.
In the usual style of EF range telephoto lenses, Canon redesigned this lens to make it compact (similar to the popular 70-200mm when zoomed out). Inside, it has 21 elements that combine fluorite and super ultra-low dispersion lenses, in addition to Canon’s innovative anti-reflective coating.
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