GB 1,050,055, Example 1
| 9 elements / 6 groups |
| f = 29.5 mm nominal; e-line EFL ≈ 29.11 mm |
| F/1.2 |
| 1/25× reduction objective |
| all-spherical |
Fixed-conjugate 1/25× reduction objective. The BF slider records the infinity-equivalent BFD and the patent β = −0.04 image distance; no internal focus group is present.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIH13 (OHARA catalog equivalent; production supplier unspecified; patent e-line index stored) |
| L2 | Biconvex Positive | Unmatched (F5-class patent e-line value; no verified d-line catalog identity) |
| L3 | Biconvex Positive | Unmatched low-index crown 449/670 (patent e-line index stored) |
| L4 | Biconcave Negative | Unmatched SF8-class dense flint (patent e-line index stored) |
| L5 | Biconvex Positive | Unmatched (LAK9-class patent e-line value; no verified d-line catalog identity) |
| L6 | Plano-Convex Positive | SK15 / S-BSM15 class barium crown (patent e-line index stored) |
| L7 | Negative Meniscus | Unmatched (F8-class light flint; patent e-line index stored) |
| L8 | Positive Meniscus | Calcium fluoride / CaF2 (patent e-line index stored) |
| L9 | Positive Meniscus | BK7 / S-BSL7 class borosilicate crown (patent e-line index stored) |