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What does USA stand for?

USA stands for USM Standard AutoFocus

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This definition appears somewhat frequently

See other definitions of USA

Other Resources: Acronym Finder has 58 verified definitions for USA

Samples in periodicals archive:

Special Canon EF 50mm f/1. 2L USM Ultra-Fast Standard AutoFocus.
Canon EF 50mm f/1. 2L USM Ultra-Fast Standard AutoFocus Lens Kit, USA wit.