Canon lens factory tourDigital Camera World: 20 things you never knew about Canon lenses

Canon’s Utsunomiya lens factory is around 60 miles north of Tokyo, and around 50 minutes by bullet train. Spotlessly maintained inside and out, this is where Canon makes its L-series lenses using a combination of manual and automated assembly. Workers (and visitors) wear protective clothing and must pass through an air shower before entering dust-free environments.