JP S57-64716A — Canon / Ikemori Keiji
| 14 elements / 10 groups |
| f ≈ 14.0 mm |
| F/2.8 |
| 2ω = 114° |
| 1 aspherical surface |
Infinity prescription from JP S57-64716A. Production lens uses floating correction, but the patent gives no close-focus variable spacings.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | LAC14 (Hoya) |
| L2 | Neg. Meniscus (1× Asph) | BACD14 (Hoya) |
| L3 | Negative Meniscus | LAC14 (Hoya) |
| L4 | Negative Meniscus | TAF1 (Hoya) |
| L5 | Negative Meniscus | LAC14 (Hoya) |
| L6 | Biconvex Positive | E-F8 (Hoya) |
| L7 | Biconvex Positive | E-FEL1 (Hoya; S-TIL1 equivalent) |
| L8 | Negative Meniscus | TAF1 (Hoya) |
| L9 | Negative Meniscus | TAF1 (Hoya) |
| L10 | Biconvex Positive | Dense flint 667/330 (modern CDGM H-ZF39 equivalent; historical supplier unconfirmed) |
| L11 | Biconcave Negative | E-F2 (Hoya) |
| L12 | Biconcave Negative | E-FDS1 class (Hoya; patent νd retained) |
| L13 | Biconvex Positive | S-FSL5 (Ohara) |
| L14 | Biconvex Positive | S-LAH65V (Ohara) |
Detailed analysis available in the interactive viewer above.