Tele-extenders are terrific tools for increasing the focal length of your current lenses without taking up valuable space or adding additional weight to your camera bag, and if you're a Canon shooter, you might be interested to know about the new Extender EF 1.4x III and Extender EF 2x III tele-converters.
Canon's Extender EF 1.4x III and Extender EF 2x III multiply the focal lengths of most Canon normal, macro and telephoto lenses by a factor of 1.4x and 2x respectively. Both extenders contain built-in microcomputers that provide seamless functionality between Canon (D)SLRs and lenses. Other features found on and within each of these new tele-extenders are Fluorine lens coatings and weather- and dust-proof construction. The Canon Extender EF 1.4x III and Canon Extender EF 2x III are expected to be available in December, 2010, for an approximate retail price of $500.