JPH04294310A — Susumu Sato
| 300mm f/2.8 |
| PATENT F=293.9647mm / FN=2.9 |
| 11 ELEMENTS / 9 AIR-SPACED CLUSTERS |
| PUBLISHED INNER FOCUS |
PUBLISHED inner focus: negative G2 (surfaces 10-14) translates 10.8889 mm imageward; D9 increases and D14 decreases by the same amount. The authored image plane is fixed at the rounded prescription's infinity bare-air conjugate; the patent's approximately 0.685 mm Bf offset is unresolved and no unprescribed plate is modeled.
| Element | Type | Glass |
|---|---|---|
| L11 | Positive Meniscus | J-FKH1 (HIKARI catalog equivalent; production supplier unspecified) |
| L12 | Biconvex Positive | J-FKH1 (HIKARI catalog equivalent; production supplier unspecified) |
| L13 | Biconcave Negative | J-LAF7 (HIKARI catalog correlation; patent vendor unspecified) |
| L14a | Negative Meniscus | K-LaK14 (SUMITA catalog equivalent; production supplier unspecified) |
| L14b | Positive Meniscus | J-PSKH1 (HIKARI catalog equivalent; production supplier unspecified) |
| L21a | Positive Meniscus | E-LAFH2 (HIKARI catalog correlation; patent vendor unspecified) |
| L21b | Biconcave Negative | SK5 (SUMITA catalog equivalent; production supplier unspecified) |
| L22 | Biconcave Negative | S-LAL52 (OHARA catalog equivalent; production supplier unspecified) |
| L31 | Biconvex Positive | J-FKH1 (HIKARI catalog equivalent; production supplier unspecified) |
| L32 | Negative Meniscus | SF6 (SCHOTT catalog equivalent; production supplier unspecified) |
| L33 | Positive Meniscus | FD3 (HOYA catalog equivalent; production supplier unspecified) |