2x Digital AF Teleconverter for Canon EF/EF-S

• Works with most Canon EF/EF-S mount lenses greater than 50mm
• Autofocus supported by lenses with a maximum aperture of f/4 and larger
• Select lenses, including 50mm f/1.8 lenses, should be used in manual focus mode for optimal performance

4 elements to ensure sharp imagery. This multi-coated optics converter that will double the effective focal length of your EF or EF-S lens, for example it will convert an 85mm lens to 170mm. This doubling effect has a light loss of about 2 stops, an f/1.4 lens will become an f/2.8 lens. Additionally, this teleconverter offers full communication between the lens and camera to enable autofocus and other electronically controlled functions.