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Six months - used equipment that tests to specs
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This Canon Extender EF 1.4x III is a professional grade 1.4 times teleconverter for Canon EF mount film and digital cameras. This teleconverter was designed for use with Canon's L series lenses, its incredible design will increase the range of your lens while maintaining maximum sharpness and optical integrity. This converter will reduce light hitting your film/sensor by one full stop.