Sigma is a well-known Japanese optical company founded in 1961, known for producing high-quality cameras, lenses and photographic accessories. Sigma is particularly known for its innovative and diverse lens product line, including a variety of models from wide-angle to telephoto to meet different photographic needs. Its Art series lenses are widely praised by professional photographers and photography enthusiasts for their excellent optical performance and fine craftsmanship. In addition, Sigma also produces its own digital cameras, such as the Quattro series, which provides extremely high image resolution and color reproduction with its unique Foveon X3 sensor technology. The company is committed to manufacturing all its products in Japan, ensuring high standards of quality control. Through continuous technological innovation and pursuit of high quality, Sigma has occupied an important position in the global photographic equipment market.