US 5,572,276 A, Embodiment 1 — Jun Hirakawa
| 16 ELEMENTS / 13 GROUPS |
| DESIGN f = 81.63–196.00 mm |
| DESIGN F/2.8 |
| ALL SPHERICAL |
| 4 ED ELEMENTS |
Infinity only. The patent focuses by moving the positive G1-2 subgroup (L3, L4) toward the object, with the other groups fixed, but prints no close-focus spacings (only aberration plots at 1.5 m), so no focus travel is modeled. Pentax rates the lens to 1.4 m. The intermediate zoom spacings and the iris position are inferred, not factory data.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | FCD1 (catalog equivalent; supplier unconfirmed) |
| L2 | Negative Meniscus | S-TIH11 (catalog equivalent; supplier unconfirmed) |
| L3 | Biconvex Positive | S-FPL53 (catalog equivalent; supplier unconfirmed) |
| L4 | Positive Meniscus | FCD1 (catalog equivalent; supplier unconfirmed) |
| L5 | Biconcave Negative | S-BSL7 (catalog equivalent; supplier unconfirmed) |
| L6 | Biconcave Negative | S-LAL14 (catalog equivalent; supplier unconfirmed) |
| L7 | Positive Meniscus | S-TIH6 (catalog equivalent; supplier unconfirmed) |
| L8 | Negative Meniscus | S-LAH65 (catalog equivalent; supplier unconfirmed) |
| L9 | Biconvex Positive | S-LAL14 (catalog equivalent; supplier unconfirmed) |
| L10 | Biconvex Positive | S-BSL7 (catalog equivalent; supplier unconfirmed) |
| L11 | Negative Meniscus | S-TIH6 (catalog equivalent; supplier unconfirmed) |
| L12 | Positive Meniscus | FCD1 (catalog equivalent; supplier unconfirmed) |
| L13 | Positive Meniscus | S-FSL5 (catalog equivalent; supplier unconfirmed) |
| L14 | Negative Meniscus | S-TIH6 (catalog equivalent; supplier unconfirmed) |
| L15 | Negative Meniscus | S-LAH55 (catalog equivalent; supplier unconfirmed) |
| L16 | Positive Meniscus | S-FSL5 (catalog equivalent; supplier unconfirmed) |