JP2022-100641A EXAMPLE 1 — COSINA / HATTA Shōju, SHIBATA Yūki
| 10 ELEMENTS / 7 GROUPS |
| f = 28.50 mm |
| F/2.0 |
| 2ω = 75.4° |
| 2 ASPHERICAL SURFACES (1 ELEMENT) |
| 2 APD ELEMENTS |
Unit focus: entire lens assembly translates forward 1.93 mm via helicoid. No internal group movement. BFD increases from 18.40 mm (∞) to 20.33 mm (m = 0.0676). Subject-to-sensor distance at closest focus ≈ 492 mm.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | BSC7 (HOYA) / N-BK7 (Schott) |
| L2 | Plano-Concave | E-F3 (HOYA) / SF2 (Schott) |
| L3 | Plano-Convex | S-LAH58 (OHARA) / N-LASF46A (Schott) |
| L4 | Biconvex Positive | S-LAH58 (OHARA) |
| L5 | Biconcave Negative | E-FD15 (HOYA) / N-SF14 (Schott) |
| L6 | Biconcave Negative | S-TIH1 (OHARA) / SF1 (Schott) |
| L7 | Biconvex Positive | S-LAC14 (OHARA) / N-LaK14 (Schott) |
| L8 | Biconvex Positive | S-LAH60MQ (OHARA) |
| L9 | Negative Meniscus | Unconfirmed (no exact catalog match) |
| L10 | Neg. Meniscus (2× Asph) | NBFD3 (HOYA) / S-LAH63Q (OHARA) |
Detailed analysis available in the interactive viewer above.