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Older Revision of Canon EF 40mm f 2 8 STM Lens

Revision: 20130616_010524 | All Revisions

Canon EF 40mm f/2.8 STM Lens

STM Instead of going with the established and highly acclaimed UltraSonic Motor (USM), Canon decided to use its new STM technology in this lens. The reason is because Whereas the USM is a combination of mechnical and electrical mechanism, the STM is practically an electrical system.

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