The Canon EW-53B Lens Hood reduces the effect of stray light by preventing it from entering the front element of the lens. Canon EW-53B Lens Hood also helps to maintain the integrity of the glass in the lens via its finger-hook (also called 'circled finger-hook, or CFH') added for a protection in case the lens gets accidentally dropped or something of the sort.
WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
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