I've always been very fond of detailed and illustrated descriptions of how different manufacturing processes work. The show "How It's Made" has always been a favourite of mine.

Being very interested in photography, I read a lot of photo related web sites, and came across this excellent article on Imaging Resource on how photographic lenses are made.

It provides a good commentary with a lots of excellent close-ups of the complex machinery involved in the mostly automated manufacturing processes to produce the lenses that Sigma sells.

This manufacturing process is interesting, in that it also involves machining glass. Most articles and Youtube videos , etc., are about machining different kinds of metals so the challenges involved in machining glass is a nice addition. Take a look at this grinder:

(credit: Imaging Ressource)

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