Recently, Canon filed a patent for five new super-telephoto lenses with ... like the rumored Canon RF 400mm f/4.0, would definitely make these lenses more accessible to serious enthusiasts and ...

In summary, the Canon EF 400mm f/2.8L IS III USM lens is a superb performer. You can view additional images in the Equipment Database, where you can add your own review, photos and product ratings.

OM System has lenses across wide-angle, standard, and telephoto zoom ... Sony's lenses can be surprisingly light. Even its 400mm f/2.8 is light enough to hand-hold for extended periods.

"The PENTAX smc P-A* 400mm F5.6 telephoto lens is a manual focus lens with automatic aperture. It is an excellent general-use lens ideal for sports and wildlife photography. Like all PENTAX lenses ...