US 3,737,214 Example I — Nippon Kogaku / Shimizu
| 12 elements / 9 groups |
| 6 mm circular fisheye |
| F/2.8 |
| 220° angle of field |
| All-spherical |
Unit focus; entire optical assembly translates relative to the film plane.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | J-BK7A (HIKARI; N-BK7 / S-BSL7 equivalent) |
| L2 | Negative Meniscus | J-BK7A (HIKARI; N-BK7 / S-BSL7 equivalent) |
| L3 | Negative Meniscus | J-BK7A (HIKARI; N-BK7 / S-BSL7 equivalent) |
| L4 | Biconcave Negative | J-SK16 (HIKARI; N-SK16 / S-BSM16 equivalent) |
| L5 | Positive Meniscus | J-SF10 (HIKARI; N-SF10 / S-TIH10 equivalent) |
| L6 | Weak Biconvex Positive | J-SF2 class (HIKARI; patent nd is +0.00062 above current J-SF2) |
| L7 | Biconvex Positive | 534554 — crown glass (patent nd=1.53375, νd=55.4; no current HIKARI catalog match) |
| L8 | Negative Meniscus | J-LASF016 (HIKARI; S-LAH66 / TAF1 / N-LAF34 equivalent) |
| L9 | Positive Meniscus | J-K3 (HIKARI; S-NSL3 equivalent) |
| L10 | Negative Meniscus | Unmatched lanthanum dense flint (796/408; nearest current HIKARI glasses are J-LASF02/J-LASF03 class) |
| L11 | Biconcave Negative | J-SF1 (HIKARI; N-SF1 / S-TIH1 equivalent) |
| L12 | Biconvex Positive | J-BK7A (HIKARI; N-BK7 / S-BSL7 equivalent) |
Detailed analysis available in the interactive viewer above.