EFL (ef­fec­tive fo­cal length)

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A mea­sure for com­par­ing the an­gle of view and mag­ni­fi­ca­tion of dif­fer­ent lenses and lens set­tings, what­ever the size of imag­ing chip be­ing used. The ac­tual fo­cal length is con­verted to the equiv­a­lent fo­cal length that would give the same an­gle of view on a cam­era us­ing 35mm. See fo­cal length.

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