Don't understand . . . . explanation needed!

Started Feb 7, 2013 | Discussions thread
BigBen08 Veteran Member • Posts: 5,573
Re: Don't understand . . . . explanation needed!

Legion5 wrote:

This is focus breathing. Focal length is measured at infinity, so if you focus closer than infinity some lenses will shift the focal length based on their optical design. The shift can be very significant and almost halv the focal length on some lenses like the Nikon 70-200mm which a MFD has an FOV equal to a 135mm lens.

Focus breathing was the term I was trying to recall. When the new Nikon 70-200 was released  focus breathing was a big issue on the Nikon forums.

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