New Nikon Patents: 400mm, 500mm and 600mm f/5.6 Phase Fresnel (PF) Lenses

Nikon 400mm f/5.6 lens patent

Nikon recently filed a new patent (P2018-17857A) in Japan for 400mm f/5.6 (22cm long), 500mm f/5.6 (28cm long) and 600mm f/5.6 (33cm long) full frame Phase Fresnel (PF) lenses.

Nikon 500mm f/5.6 lens patent

Nikon 600mm f/5.6 lens patent

Reminder: Currently, Nikon AF-S NIKKOR 300mm f/4E PF ED VR Lens ($1,996.95) is the only Phase Fresnel (PF) lens from Nikon.

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Via: NikonRumors