Making 'Art': We go inside Sigma's lens factory
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Making 'Art': We go inside Sigma's lens factory

Anodization is another important process, which increases corrosion and wear resistance. Here, a rack of metal components is lowered into an acid bath as part of the anodization process. This part of the factory is hot and smelly - a distinct contrast to the clean, cool and unexpectedly quiet atmosphere in most of the facility.