Pentax is a brand name used primarily by Ricoh Imaging Company for cameras, sport optics , and CCTV optics. The brand is also used by Hoya Corporation for medical products & services, TI Asahi for surveying instruments, and Seiko Optical Products for certain optical lenses.
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Pentax in consonance with Wikipedia. Pentax, essentially japanese brand, ricoh cameras for imaging electronics, optics including riflescopes, optics.