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Polishing is the most important process during the manufacture of a lens with the highest possible quality. Every part of the manufacturing process is done in-house at SIGMA, including the establishing of a primary standard used to measure our products’ surfaces. Thanks to their wealth of experience and knowledge, our expert craftsmen are able to polish with a precision up to a millionth of a millimeter.

photo : Motonobu Okada
lens : SIGMA APO 70-200mm F2.8 EX DG OS HSM

SIGMA Aizu factory, Optical Element Processing, Fifth Department Supervisor
Masaru Shiraiwa

While lens manufacture is a skill that reaches back to the days of Isaac Newton, it is nonetheless incredibly difficult to combine precision, exterior appearance and high quality during the creation of a lens. The sheer joy when the highest possible precision was achieved during the polishing stage and a high-quality lens is finally finished can hardly be described in words.

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