Nikon’s patent for a Nikkor 600mm f/4 FL lens (with fluorite element)

Nikkor 600mm f:4 FL lens patent
Few months ago I reported that Nikon will start upgrading their remaining high end tele-lenses with fluorite element (FL). We are already seeing the first signs of this rumor: a new patent got published in Japan today for a Nikkor 600mm f/4 FL lens which will replace the current 600mm f/4G ED VR AF version. As of today, only two Nikon lenses have FL element: the 400mm f/2.8E FL ED VR and 800mm f/5.6E FL ED VR.

See also this related video on Nikon’s FL element:

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