Canon EF 400mm f/4 DO IS II USM Lens Review

Specification

Canon EF 400mm DO IS II USM Lens (6)

A professional-grade telephoto lens, which sports a moderately fast maximum aperture of f/4, image stabilisation, silent focusing with full-time manual focus override and a relatively compact design, thanks to the use of Diffractive Optics. This is quite a specialised lens, costing around £7000, so we'll take a close look at how it performs in this review. 

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