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Lens will fit only Canon C-8 teleconverter lenses. Please note that it is a slip on type cap. It is little bit too larger for 77mm rim. Since canon C-8 lens has built in hood , that goes over the lens lip.
Item has been used, with some signs of cosmetic use. However it is not damaged in any way, no cracks or dents (see pics). This Cap is fully operational and functions as intended. I would rate it a 9 on a scale from 1 to 10.