What does EF stand for in an optical module
EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens. The EF lens mount was launched at the same time as the Canon EOS SLR camera system in 1987. EFin in Optics refers to Encircled Flux, which is a measure of the total optical power enclosed within a certain radius in an optical system, crucial for assessing the performance of imaging devices.
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