The home of the L-series: Inside Canon's Utsunomiya lens factory
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The home of the L-series: Inside Canon's Utsunomiya lens factory

On the left is the diamond plate, which takes its shape precisely from the prototype standard. This is used to make the lens polishing tool. Each grey disk on the plate is a diamond grindstone. On the right is the polishing tool itself, with its array of polyurethane pads, which is used to polish a single side of each glass element.

Each surface of every element takes roughly 90 minutes to polish, and this is done by hand.