Especially known for its filters Tokina has been producing conversion lenses since the 1960s
and now produces camera lenses under the Tokina brand name.
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Tokina was founded by a group of Nikon engineers who left Nikon to concentrate on the development of high-quality zoom lenses, which were rare at the time. Originally an OEM manufacturer only, in the early 1970s they began selling lenses under their own Tokina brand. Kenko Co., Ltd. (株式会社ケンコー ,Kabushiki-gaisha Kenkō?)
a Japanese manufacturer and trading company of photographic
accessories, especially known for its filters has been producing conversion lenses since the 1960s
now produces camera lenses under the Tokina brand name.