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Add some versatility to your existing Canon EF-mount lens collection with this 2x DGII Teleconverter from Bower, which contains 7 elements to ensure sharp imagery. This teleconverter utilizes multi-coated optics that will double the effective focal length of your EF lens, for example it will convert an 85mm lens to 170mm. This doubling effect has a light loss of about 2 stops, meaning an f/1.4 lens will become an f/2.8 lens. Additionally, this teleconverter offers full communication between the lens and camera to enables autofocus and other electronically controlled functions, however it is not compatible with EF-S mount lenses.
In the Box
Bower 2x DGII Teleconverter with 7 Elements for Canon EF