Canon's EF 200-400 lens delivers terrific optics and unmatched zoom flexibility with an innovative built-in 1.4x telephoto extender ... Canon's EF 400mm f/2.8L IS II USM, for example, or $10,400 ...

The Extender RF 1.4x and Extender RF 2x offer high image quality and precision AF Drip-proof and dust-proof When used in combination with compatible lenses, they can dramatically increase capture ...