How are camera lenses made?

Ever wondered how camera lenses are put Together a while ago I visited samyang Optics Factory in masan South Korea a Place close to my heart as I Coincidently used to teach English as a Foreign language in that very City this Factory is a major operation employing Hundreds of experienced workers who go In and out through special dust removing Entrances this plate of glass elements Many of which make up each camera lens Is about to be polished before they're Carefully assembled into the lens body To make up the final product this is Where it's so important that not a Single bit of dust gets inside the lens It can affect image quality and even Grow into mold over time everything's Carefully put together with huge Precision as the slightest mistake can Cause Optical problems in a finished Lens then comes one final inspection Before the lenses are boxed up and sent Around the world and of course they like To display and show off their special Edition lenses from the past to Celebrate their history