When Canon introduced the EF-S 10-18mm f/4.5-5.6 IS STM lens in 2015 one of my first thoughts was how it would compare with the venerable EF-S 10-22mm f/3.5-4.5 USM, especially with the amazing low price of the newer 10-18mm lens. What are the key differences between the Canon EF-S 10-18mm STM vs Canon EF-S 10-22mm USM lenses and is it worth the more than double the price difference for the older 10-22mm lens?
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