Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4x III incorporates phenomenal optical performance with minimal chromatic aberration and is a perfect complement to many of Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens and extender; features careful lens placement and coatings to minimize ghosting and flare and even has a Fluorine coating that keeps soiling, smears and fingerprints to a minimum. An integral part of many professional systems, Extender EF 1.4x III maintains high standards not only optically, but also in terms of rugged, dustproof and water resistant construction.
Price: £525.58 from Currys Business
Lens cap E-43 protects your lens against smudges, bumps, and dust. It becomes extremely useful when carrying lenses around or simply for storing purposes.