Each lens are made in accordance with the features and functions that it has. And the following are codes on Sigma lenses and the meaning to each one.
EX – EX Lenses are premium lenses in the Sigma lens product line, like the L Series of Canon lenses. It’s no surprise that EX coded lenses are usually relatively expensive.
DC – DC Lenses are lenses designed specifically for cameras with a
DG – DG lenses are Sigma lenses designed for both the full-frame and cropped sensors.
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