Photo Plus - - A-Z Guide -

Stands for Electro Fo­cus Short back fo­cus, a lens mount in­tro­duced by Canon in 2003. EF-S lenses have a small im­age cir­cle so they are only suit­able for use on crop-fac­tor SLRS. A mod­i­fied mount means that they can’t phys­i­cally be fit­ted onto in­com­pat­i­ble (eg full-frame) Canon mod­els.

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