What is Focus Breathing?

Some lenses change apparent focal length during focus due to their optical design.

A demonstration of focus breathing in the Nikon 50mm f/1.8 lenses

Some lenses change their apparent focal length as you move from infinity to near focus. This phenomenon is called “focus breathing.” In the video above, I demonstrate what this looks like using the Nikon 50mm f/1.8G and Nikon 50mm f/1.8S lenses on a Nikon Z7 mirrorless camera.

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