The name "Pentax" was originally a registered trademark of the East German VEB Zeiss Ikon (from "Pentaprism" and "Contax") but, as all Germans patents were annulled with the country's defeat, the name "Pentax" was taken by the Asahi Optical company in 1957.
Enterbrain published two volumes of a light novel series titled Photo Kano: Pentaprism Memories, written by Fumihiko Shimo and illustrated by Natsume Shimano, between March and June 2012.