CN 118671950 A — Dayong Li
| 14 ELEMENTS / 11 GROUPS |
| DESIGN f = 55.02 mm |
| DESIGN F/2.87 |
| 67 mm IMAGE CIRCLE |
| SHIFT ±12 mm / TILT ±10° |
| 1× MACRO |
| NO ASPHERES |
Floating internal focus; the patent tabulates infinity, 0.5× and 1.0×. G1 fixed. G2 with the stop advances 46.29 mm toward the object and G3 advances 37.92 mm, opening the stop-to-G3 gap from 1.47 to 9.84 mm at constant overall length. The printed 1.0× state computes to −0.96× paraxially at 265 mm object-to-image (Laowa quotes 27 cm). Spacings between the three states are interpolated, not published. All three states are coaxial; the patent gives no tilted or shifted prescription.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | H-FK61 (CDGM coordinate equivalent; supplier unconfirmed) |
| L2 | Biconcave Negative | Unmatched (native nd=1.49700, vd=85.00; supplier unconfirmed) |
| L3 | Biconvex Positive | Unmatched (native nd=1.57371, vd=70.00; supplier unconfirmed) |
| L4 | Plano-Convex | 883408 — coordinate class; supplier unconfirmed |
| L5 | Positive Meniscus | 883408 — coordinate class; supplier unconfirmed |
| L6 | Biconcave Negative | Unmatched (native nd=1.85561, vd=23.21; supplier unconfirmed) |
| L7 | Biconvex Positive | 923209 — coordinate class; supplier unconfirmed |
| L8 | Negative Meniscus | H-ZF52 (CDGM coordinate equivalent; supplier unconfirmed) |
| L9 | Biconvex Positive | H-FK61 (CDGM coordinate equivalent; supplier unconfirmed) |
| L10 | Positive Meniscus | Unmatched (native nd=1.78451, vd=48.06; supplier unconfirmed) |
| L11 | Negative Meniscus | Unmatched (native nd=1.78346, vd=32.08; supplier unconfirmed) |
| L12 | Biconcave Negative | H-FK61 (CDGM coordinate equivalent; supplier unconfirmed) |
| L13 | Positive Meniscus | Unmatched (native nd=1.53878, vd=52.52; supplier unconfirmed) |
| L14 | Biconvex Positive | 883408 — coordinate class; supplier unconfirmed |