JP2018180366A Numerical Data 1 — Canon Inc.
| 14 elements / 8 groups |
| f = 32.34 mm design |
| F/1.45 design; f/1.4 marketed |
| 2ω = 45.8° |
| 1 aspherical surface |
Patent first-group focusing: surfaces 1-20A, including the stop, move objectward while rear group 21-23 remains fixed. The implemented variable gap is patent d20 = 1.10 mm at infinity and 9.71 mm at the patent close state (β≈-0.188).
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | S-NBM51 (OHARA, 613443) |
| L2 | Biconvex Positive | TAFD35L (HOYA, 911353) |
| L3 | Negative Meniscus | S-NBH56 (OHARA, 855248) |
| L4 | Biconvex Positive | TAFD35L (HOYA, 911353) |
| L5 | Biconvex Positive | FCD505 (HOYA, 593686) |
| L6 | Biconcave Negative | S-NBH53/S-NBH53V class (OHARA, 738323) |
| L7 | Positive Meniscus | S-LAH96 (OHARA, 764485) |
| L8 | Negative Meniscus | Unmatched (675/348 partial-dispersion flint; patent nd=1.67542, vd=34.8, θgF=0.5825) |
| L9 | Biconvex Positive | S-LAH58 (OHARA, 883408) |
| L10 | Negative Meniscus | S-TIM25 (OHARA, 673321) |
| L11 | Biconcave Negative | S-NSL36 (OHARA, 517524) |
| L12 | Biconvex Positive (1× Asph) | MP-TAFD305 / MC-TAFD305 (HOYA, 851401) |
| L13 | Biconvex Positive | S-LAH58 (OHARA, 883408) |
| L14 | Negative Meniscus | TAFD40-W / TAFD40 (HOYA, 001255) |
Detailed analysis available in the interactive viewer above.