NIKON NIKKOR 600mm f/5.6 ED

US 3,774,991, Example II — Yoshiyuki Shimizu

5 ELEMENTS / 4 GROUPS
600mm f/5.6
4°10′ MARKETED AOV
8° PATENT DESIGN FIELD
AU-1 FOCUSING UNIT

Focus Mechanism

Infinity prescription only. The production lens focuses to 11 m with a separate focusing unit; its AU-1 focus motion is not modeled.

Optical Elements (5 physical)

ElementTypeGlass
L1Biconvex PositiveUnmatched (486815 — fluophosphate crown; vendor unresolved)
L2Biconcave Negative744449 — lanthanum glass coordinate class (vendor unresolved)
L3Positive Meniscus570495 — barium flint glass coordinate class (vendor unresolved)
L4Biconcave Negative527511 — crown-flint coordinate (CF2 dispersion proxy; supplier unresolved)
L5Biconvex Positive624470 — barium flint glass coordinate class (vendor unresolved)