Canon 2X EF Extender III Teleconverter (L Series Tele/Zoom Lenses)

The Canon 2X EF Extender III is a professional grade teleconverter designed exclusively for use with select Canon brand L-Series lenses (focal lengths over 135mm).  Doubling the lens focal length, Extender EF 2X III incorporates incorporates careful lens placement and state of the art coatings for phenomenal optical performance with minimal chromatic aberration and minimal flare or ghosting.  The converter also features a built-in microcomputer for seamless communication between camera body, lens, and extender.  Extender EF 2X III maintains high standards not only optically, but also in terms of rugged, dustproof and weather resistant construction and features a fluorine coating keeps soiling, smears and fingerprints to a minimum.  Often an integral part of a professional's kit, Extender EF 2X III is a very practical complement to compatible* telephoto lenses.

Key Features

• High quality optics, 9 elements in 5 groups
• Multiplies focal length by 2X
• Reduces effective maximum aperture by two f/stops
• Fluorine Coating
• EF Mount but only accepts select Professional L-Series Lenses
• Less cumbersome than carrying another large lens

Compatible* Lenses include:

• EF 70-200mm f/2.8L USM
• EF 70-200mm f/2.8L IS USM
• EF 70-200mm f/2.8L IS II USM
• EF 70-200mm f/4L USM
• EF 70-200mm f/4L IS USM
• EF 100-400mm f/4.5-5.6L IS USM
• EF 100-400mm f/4.5-5.6L IS II USM
• EF 135mm f/2L USM
• EF 180mm f/3.5L Macro USM
• EF 200mm f/1.8L USM
• EF 200mm f/2.8L USM
• EF 200mm f/2.8L II USM
• EF 200mm f/2L IS USM
• EF 300mm f/2.8L USM
• EF 300mm f/2.8L IS USM
• EF 300mm f/2.8L IS II USM
• EF 300mm f/4L USM
• EF 300mm f/4L IS USM
• EF 400mm f/2.8L USM
• EF 400mm f/2.8L II USM
• EF 400mm f/2.8L IS USM
• EF 400mm f/2.8L IS II USM
• EF 400mm f/4 DO IS USM
• EF 400mm f/4 DO IS USM II
• EF 400mm f/5.6L USM
• EF 500mm f/4.5L USM
• EF 500mm f/4L IS USM
• EF 500mm f/4L IS II USM
• EF 600mm f/4L USM
• EF 600mm f/4L II USM
• EF 600mm f/4L IS USM
• EF 600mm f/4L IS II USM
• EF 800mm f/5.6L IS USM

*Compatibility Note: if the effective maximum aperture of the converter and lens combination exceeds the capabilities of your cameras's AF system then autofocus will not be possible.