We are a family-owned company. Founded in 1961 by Michihiro Yamaki, Sigma is now led by his son, Kazuto Yamaki. Remaining family-owned ensures our independence and gives us the freedom to think differently.
Established in 1973, the factory houses Sigma’s entire production. Keeping our production local is essential. It allows agility, close collaboration between departments, and rigorous quality control over every aspect — from design and engineering to lens polishing, molding plastic and metal parts, mounting, and assembly. Being rooted in the region also enables us to support its culture while drawing from its rich manufacturing knowledge, expertise, and skill.
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