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The E-163B Lens Cap for EF 500mm F/4 Lens from Canon is designed specifically for the EF 500mm f/4L IS II USM lens. It is a padded lens cover that slides on around the front end of the lens barrel with or without the lens hood in place. It offers protection from impact, dust, moisture and fingerprints when the lens is not in use. The E-163B tightens to stay in place with a touch fastener strap.