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What is the difference between “Back Focal Distance” and “Flange Focal Distance” of a Lens?

April 26, 2017focal Lens

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What is the difference between “Back Focal Distance” and “Flange Focal Distance” of a Lens?

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Focal length of a lens = the distance between the last glass element (outward facing vertex) to the image plane. Flange Focal Distance = the distance between the lens mounting plane (thread reference surface) to the image pane.