Designed as a quick-focusing macro lens the AF speed of 50mm, f/2.8 EX Macro is 1.4 times faster than previous 50mm f/2.8 macros. It features a non-ro

Designed as a quick-focusing macro lens the AF speed of 50mm, f/2.8 EX Macro is 1.4 times faster than previous 50mm f/2.8 macros. It features a non-rotating front lens group which makes it easier to work with polarizing filters and has a focus limiter.