We flew to Aizu, Japanm to find out how some of the world’s best and most popular lenses are made at Sigma's one and only factory. advertisement. Digital Camera World.

Headlights are the most important things to keep clean on your car. Not only do these powerful beams let you see the road, they let other motorists see you. Most headlight lenses are made of ...

These types of lenses are usually made from polycarbonate or Trivex. Another material often used to meet specific prescription needs is glass — but glass lenses can be heavy on the face, and ...