The EF 400mm f/4 DO IS USM with 'Multi-Layer Diffractive Optical (DO) Element' incorporating beneficial light diffraction, is a major breakthrough. Canon say the outstanding feature of the lens is its ...

Canon's EF 200-400 lens delivers terrific optics and unmatched zoom flexibility with an innovative built-in 1.4x telephoto extender. Stephen Shankland Former Principal Writer Stephen Shankland worked ...

We spend a day shooting aeroplanes with Andy Rouse to test the new Canon EF 200-400mm f/4L IS USM Extender 1.4x lens. The Canon EF 200-400mm f/4L IS USM Extender 1.4x is a professional quality ...

For example, they allow Canon to make telephoto lenses, like its EF 400mm f/4 DO IS II USM, smaller than they otherwise would ...

The laws of physics and the nature of light dictate that super-telephoto lenses with big apertures will always be big, heavy, and expensive. They require small tolerances across giant slabs of glass, ...

A new 400mm supertele is just the beginning. Canon also says it plans a replacement for its 100-400mm zoom and new compact models using diffractive optics. Stephen Shankland worked at CNET from 1998 ...

The Canon RF 400mm F2.8L IS USM and RF 600mm F4L IS USM are two new super telephoto lenses that offer incredible focusing speeds. Optically identical to the EF versions, the RF 400mm and 600mm both ...

This is Canon’s longest zoom lens and is categorised as one of their L range. The lens has been around for some time now, earning itself a somewhat mixed reputation amongst digital photographers that ...

Canon’s EF 200-400mm f/4L IS USM Extender 1.4X more than satisfies the requirements of its target market. Sports and wildlife photographers should be delighted by the convenience of the built-in ...