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Full-Time Manual Focus
Many EF lenses are equipped with a ring-type USM which allows full-time manual focus in AF mode. This means you can manually fine-tune focusing as soon as auto focus is complete, without having to switch to manual focusing mode. Full-time manual
focusing on most compatible lenses uses a mechanical system for instant responsiveness. Full-time manual focus is also possible on some lenses equipped with a Micro USM, such as the EF 50mm f/1.4 USM.
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Click here to find out more about the Canon EF Lens Range and Technology.
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