Marumi Optical Co., Ltd. is a Japanese designer and manufacturer of photographic lens filters, with more than 85 years of experience serving photographers and optical enthusiasts worldwide. The company’s headquarters are in Tokyo, and its manufacturing plant is in Nagano. Marumi develops products for photographers, filmmakers, and other imaging users, supported by information on its technologies, product specifications, and filter performance.

Its range includes screw-in, magnetic, square, and Cine & TV filters. Product categories cover UV and lens protection, polarizers, neutral-density filters, macro and close-up filters, and creative effects, as well as holders, rings, and adapters. Featured offerings include the PRIME II lens protector, DHG Achromat macro filters, and PRIME Plasma Sputtering C-P.L polarizers. Accessories include lens caps, lens cleaners, step rings, and filter cases. Marumi also provides a technology and download center, company and product information, distributor details, and consumer and B2B contact channels. Its website currently states that direct online purchasing is temporarily suspended, with no reopening date announced.