US 4,523,816 — Melvyn H. Kreitzer
| 10 POWERED COMPONENTS / 7 GROUPS |
| f = 437.4 mm (PATENT) |
| F/4.5 FIXED |
| 24×36 mm FORMAT |
| 1 ASPHERICAL SURFACE |
| CASSEGRAIN / INTERNAL FOCUS |
Internal focus by axial translation of negative group G2; Table IV gives no close-focus spacing state, so the data file retains the single published configuration.
| Element | Type | Glass |
|---|---|---|
| M2 | Convex First-Surface Mirror | Reflective surface (substrate unprescribed) |
| L1 | Plano-Convex Corrector (1× Asph) | PMMA (methyl methacrylate; historical attribution, not catalog glass) |
| L2 | Biconvex Positive | BSC7 (HOYA) |
| L3 | Negative Meniscus | E-FD5 (HOYA) |
| M1 | Annular Concave First-Surface Mirror | Reflective surface (substrate unprescribed) |
| L4 | Negative Meniscus | LAC10 (HOYA, legacy) |
| L5 | Biconvex Positive | Unmatched (dense flint 728/261; no official HOYA or SUMITA catalog match) |
| L6 | Biconcave Negative | NBFD10 (HOYA, legacy) |
| L7 | Positive Meniscus | BSC7 (HOYA) |
| L8 | Negative Meniscus | LAC10 (HOYA, legacy) |