US 5,568,323 A, Example 3 — Takayuki Sensui
| 14 ELEMENTS / 11 GROUPS |
| DESIGN f = 29.00–68.00 mm |
| DESIGN F/2.8 |
| 1 ASPHERICAL SURFACE / 1 ELEMENT |
| HYBRID ASPHERICAL FRONT ELEMENT |
Finite focusing is not modeled: the patent tabulates infinity only, and both focus positions repeat the infinity spacings at every zoom setting. Pentax specifies a 0.43 m minimum focus distance, but no focusing movement is published. The wide, middle and tele spacings are printed; the middle and tele image planes follow from G3 and the stop staying fixed, because the patent's constant 39.87 mm fB is a printing error. Positions between them are interpolated, not the factory cam.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-LAH66 (catalog equivalent; supplier unconfirmed) |
| Resin | Bonded Aspheric Resin Layer | Unmatched (aspheric resin layer; nd 1.5201, νd 50.8) |
| L2 | Biconcave Negative | S-LAL18 (catalog equivalent; supplier unconfirmed) |
| L3 | Positive Meniscus | SFLDN3 (catalog equivalent; supplier unconfirmed) |
| L4 | Biconvex Positive | S-LAH66 (catalog equivalent; supplier unconfirmed) |
| L5 | Negative Meniscus | S-TIH1 (catalog equivalent; supplier unconfirmed) |
| L6 | Negative Meniscus | S-TIH6 (catalog equivalent; supplier unconfirmed) |
| L7 | Positive Meniscus | S-FSL5 (catalog equivalent; supplier unconfirmed) |
| L8 | Positive Meniscus | S-LAH66 (catalog equivalent; supplier unconfirmed) |
| L9 | Positive Meniscus | SFLDN3 (catalog equivalent; supplier unconfirmed) |
| L10 | Biconcave Negative | S-LAM2 (catalog equivalent; supplier unconfirmed) |
| L11 | Negative Meniscus | S-LAH53 (catalog equivalent; supplier unconfirmed) |
| L12 | Positive Meniscus | K-GFK68 (catalog equivalent; supplier unconfirmed) |
| L13 | Biconvex Positive | K-GFK68 (catalog equivalent; supplier unconfirmed) |
| L14 | Negative Meniscus | S-TIH4 (catalog equivalent; supplier unconfirmed) |