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 |
Infinity prescription only. The production lens focuses to 11 m with a separate focusing unit; its AU-1 focus motion is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | Unmatched (486815 — fluophosphate crown; vendor unresolved) |
| L2 | Biconcave Negative | 744449 — lanthanum glass coordinate class (vendor unresolved) |
| L3 | Positive Meniscus | 570495 — barium flint glass coordinate class (vendor unresolved) |
| L4 | Biconcave Negative | 527511 — crown-flint coordinate (CF2 dispersion proxy; supplier unresolved) |
| L5 | Biconvex Positive | 624470 — barium flint glass coordinate class (vendor unresolved) |