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

The Canon 2X EF Extender 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 incorporates incorporates careful lens placement and anti-reflective coatings for high quality optical performance.  The converter also features a built-in microcomputer for seamless communication between camera body, lens, and extender.  Extender EF 2X maintains high standards not only optically, but also in terms of the rugged construction pros expect.  Often an integral part of a professional's kit, Extender EF 2X is a very practical complement to compatible* telephoto lenses.

Originally Introduced in 1987, the 2X EF Extender has been a staple among Canon Pros ever since.  In 2001 Canon released an improved 2X EF Extender II that features some weather sealing and a refined optical design.

Key Features

• High quality optics, 7 elements in 5 groups
• Multiplies focal length by 2X
• Reduces effective maximum aperture by two f/stops
• 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.