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

After coating, the lens elements are placed into groups, which are then assembled into the final lens. This shot shows workers checking and assembling lens elements into groups. The elements are held in place initially by friction, inside their TSC trays, before the TSC is heated at the edges and sealed to lock the elements into place. This type of construction replaces the much more involved traditional method where glass elements were held in place by metal bezels screwed tightly into the barrel.