JP2021-056407A EXAMPLE 3 — CANON / NAKAHARA, IWAMOTO
| 17 ELEMENTS / 7 ZOOM GROUPS |
| f = 72.13–194.06 mm |
| F/2.89–2.91 |
| 2ω = 33.4–12.7° |
| 2 ASPHERICAL SURFACES (GMo) |
Dual Nano USM electronic floating focus. Group A (LN/G6, single element L15): moves image-ward for infinity→close. Group B (LR/G7, L16+L17): independent floating correction driven by second Nano USM. Close-focus gap data not available from patent — zoom-only variable gaps used as placeholder.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-FPL51 (OHARA) |
| L2 | Negative Meniscus | N-KZFS4 / S-NBM51 class (613443) |
| L3 | Plano-Convex Positive | S-FPL55 (OHARA) |
| L4 | Biconcave Negative | S-FPM2 (OHARA) |
| L5 | Biconcave Negative | 764485 - M-TAFD305 / high-index lanthanum |
| L6 | Positive Meniscus | S-NBH56 (OHARA) |
| L7 | Biconvex Positive (1× Asph) | S-FPL51 (OHARA) |
| L8 | Biconcave Negative | 593353 - S-FTM16 / titanium flint |
| L9 | Biconvex Positive | 728285 - dense flint |
| L10 | Negative Meniscus | 051269 - ultra-high-index dense flint |
| L11 | Biconvex Positive | S-FPL51 (OHARA) |
| L12 | Biconvex Positive | S-FPL51 (OHARA) |
| L13 | Negative Meniscus | 051269 - ultra-high-index dense flint |
| L14 | Biconvex Positive | TAFD37A (HOYA) |
| L15 | Negative Meniscus | S-PHM52 (OHARA) |
| L16 | Positive Meniscus | S-NBH56 (OHARA) |
| L17 | Neg. Meniscus (1× Asph) | S-BAL42 (OHARA) |
Detailed analysis available in the interactive viewer above.