US 5,717,527 — Atsushi Shibayama
| 18 elements / 14 groups |
| Patent f = 82.4-194.0 mm |
| Patent F/4.14-5.73 |
| Production 70-180mm f/4.5-5.6 |
| Front-group macro focus |
| All-spherical |
Front negative group G1 moves object-ward; d10 increases by 38.65 mm at the closest setting.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | J-SFH2 (Hikari; patent code 861230) |
| L2 | Biconvex Positive | J-SFH2 (Hikari; patent code 861230) |
| L3 | Negative Meniscus | BACED1 (HOYA catalog equivalent; production supplier unspecified; patent 617540) |
| L4 | Negative Meniscus | J-LAFH3 (Hikari catalog equivalent; production supplier unspecified; patent 795286) |
| L5 | Positive Meniscus | SF11-class dense flint (Schott, 785/258) |
| L6 | Biconvex Positive | 748523 — E-LAKH1 catalog equivalent (Hikari; production supplier unspecified) |
| L7 | Negative Meniscus | SF11-class dense flint (Schott, 785/258) |
| L8 | Positive Meniscus | S-BSM81 class (OHARA, 640/600) |
| L9 | Positive Meniscus | N-FK5 (Schott) |
| L10 | Negative Meniscus | S-LAH65V class (OHARA, 804/466) |
| L11 | Positive Meniscus | SF6-class dense flint (Schott, 805/255) |
| L12 | Biconcave Negative | S-LAH65V class (OHARA, 804/466) |
| L13 | Biconvex Positive | S-LAL14 (OHARA) |
| L14 | Biconvex Positive | N-FK5 (Schott) |
| L15 | Biconcave Negative | E-LAFH2 (Hikari; patent code 804339) |
| L16 | Positive Meniscus | N-FK5 (Schott) |
| L17 | Biconvex Positive | E-FD13 (HOYA catalog equivalent; production supplier unspecified; patent 741276) |
| L18 | Negative Meniscus | S-LAH65V class (OHARA, 804/466) |