US 2013/0314588 A1 — Yong-su Kim
| 7 ELEMENTS / 6 GROUPS |
| 45mm f/1.8 (MARKETED) |
| 46.307mm f/1.84 (DESIGN) |
| 2ω = 35.1° |
| PUBLISHED INNER FOCUS |
Focus status PUBLISHED: the single biconcave G2 element moves imageward while D1/D2 change from 2.99/6.81 mm to 7.01/2.78 mm. The source implies 4.02–4.03 mm of travel because the two-decimal gap sums differ by 0.01 mm. No reconstruction replaces the published close row; D0=407.1 mm is not an exact paraxial conjugate with the retained image plane.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | Unmatched (874287; nd=1.87387, νd=28.7) |
| L2 | Positive Meniscus | MP-LAC8-30 catalog equivalent; production supplier unspecified |
| L3 | Positive Meniscus | Q-LASFPH3S catalog equivalent; production supplier unspecified |
| L4 | Biconcave Negative | S-PHM52 catalog equivalent; production supplier unspecified |
| L5 | Biconvex Positive | S-LAH55 catalog equivalent; production supplier unspecified |
| L6 | Positive Meniscus | S-LAH55 catalog equivalent; production supplier unspecified |
| L7 | Biconcave Negative | Unmatched (765249; nd=1.76495, νd=24.9) |