...or as J-Fav might call it, "optics porn."
The folks at Gizmodo linked to a YouTube clip from the Discovery Channel showing how multi-element lenses are made. Craftmanship!
With all the attention given to dust, it's funny how the technicians don't have to wear hairnets and are allowed to wear jewelry on their hands (e.g. large wedding rings). In any case, you can't argue with the final result.
Looks like this was filmed at JML Optical.