Kenko Co., Ltd. (Japanese 株式会社 ケ ン コ ー Kabushiki-gaisha Kenkō) is a Japanese manufacturer and trading company especially known for its teleconverters and filters. Based in Tokyo, has been manufacturing lenses since the 1960s. Produces lenses under the Tokina brand.
In 2011, following a merger with another optics manufacturer, Tokina, the newly formed company was renamed Kenko Tokina Co. Ltd.