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Equivalent focal length SWPP Photographic Glossary

Friday 28th February 2020  




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Equivalent focal length

A distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the back focus. The reverse is true in a wide angle lens.



 

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06/11/2019 11:36:03