KR 10-2017-0073883 A — Jong Young Park, Jung Du Lee
| 15 ELEMENTS / 12 GROUPS |
| DESIGN f = 98.04 mm |
| DESIGN F/2.9 |
| ALL SPHERICAL |
| INFINITY-ONLY MODEL |
The patent tabulates only the infinity state. It describes rear focusing with the first group fixed and the second and third groups (L20–L34, elements 3–15) moving toward the object for close focus (paragraphs 0051 and 0065), but gives no travel or near-focus gaps, so no focusing is modelled and the lens stays at infinity for every focus setting. The production lens focuses to 0.307 m at 1:1.
| Element | Type | Glass |
|---|---|---|
| L10 | Negative Meniscus | BACED5 (Hoya; source-named catalog equivalent) |
| L11 | Positive Meniscus | NBFD11 (Hoya; source-named catalog equivalent) |
| L20 | Plano-Convex | E-FDS1 (Hoya; source-named catalog equivalent) |
| L21 | Biconvex Positive | FCD1 (Hoya; source-named catalog equivalent) |
| L22 | Biconcave Negative | FDS90 (Hoya; source-named catalog equivalent) |
| L23 | Biconvex Positive | FC5 (Hoya; source-named catalog equivalent) |
| L24 | Negative Meniscus | FDS90 (Hoya; source-named catalog equivalent) |
| L25 | Biconcave Negative | E-FD8 (Hoya; source-named catalog equivalent) |
| L26 | Biconvex Positive | FD60 (Hoya; source-named catalog equivalent) |
| L27 | Biconvex Positive | LAC10 (Hoya; source-named catalog equivalent) |
| L30 | Negative Meniscus | BAFD7 (Hoya; source-named catalog equivalent) |
| L31 | Biconcave Negative | FC5 (Hoya; source-named catalog equivalent) |
| L32 | Biconvex Positive | NBFD10 (Hoya; source-named catalog equivalent) |
| L33 | Negative Meniscus | BSC7 (Hoya; source-named catalog equivalent) |
| L34 | Negative Meniscus | E-FD10 (Hoya; source-named catalog equivalent) |