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

One of the two 'Master Craftsmen' at the Utsunomiya factory, Mr Saito explains the incredibly fine tolerances involved in the creation of 4/8K broadcast lenses. Canon claims a tolerance of +/-30 nanometers. As such, if one of the finished elements were scaled up to the size of an Olympic stadium, the surface variation would be no thicker than a plastic grocery bag. 

Yes, you read that correctly.