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Knowledge Center/ Glossary/ Principal Plane

Principal Plane

A hypothetical plane where incident light rays can be considered to bend due to refraction. Effective Focal Length (EFL) is specified from a principal plane location whereas Back Focal Length (BFL) is specified from the back surface of a lens.

See also Center Thickness (CT) , Back Focal Length (BFL) , Distance focale effective (EFL) , Conjugate Distance

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