If you’d like a primer on the technologies found inside Canon’s EF line of lenses, look no further than this 12-minute introduction created by Canon. We learn about things like aspherical lenses, fluorite lenses, diffractive optics, USM, lens coatings, and more.
Canon produced its 100 millionth EF lens back in April of 2014.
(H/T The Digital Picture)
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