The Canon Extender can be used to increase the focal length of your telephoto lens, with minimal loss of lens performance or image quality.  Note that using the extender decreases your aperture by one stop: for example a lens which is f/4 becomes f/5.6 when the 1.4x extender is used.

Canon Extenders are compatible with the following lenses offered by LensesForHire:

• EF 70-200mm f/2.8 L IS, EF 70-200mm f/2.8 L, EF 70-200mm f/4 L IS
• EF 100-400mm f/4.5-5.6 L IS
• Sigma APO 120-300mm f/2.8 EX
• EF 135mm f/2 L
• EF 200mm f/1.8 L, EF 200mm f/2.8 L
• EF 300mm f/2.8 L IS, EF 300mm f/4 L IS
• EF 400mm f/5.6 L
• EF 500mm f/4 L IS
• EF 1200mm f/5.6 L