US 4,110,006 Example 4
| Telephoto zoom, 150–600 mm f/5.6 |
| 19 elements / 15 groups |
| All-spherical prescription |
| Internal focusing group IV |
| Patent-scale model with inferred clear apertures |
Internal focusing by object-ward translation of group IV. The data file applies the patent-published 34.24 mm close-focus pull from Example 2 to Example 4, giving S1 = 5.79 mm and S2 = 37.24 mm.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | FK fluorosilicate crown class (487/701; N-FK5/S-FSL5 class) |
| L2 | Positive Meniscus | FK fluorosilicate crown class (487/701; N-FK5/S-FSL5 class) |
| L3 | Negative Meniscus | LaSF dense lanthanum-flint patent class (773/497) |
| L4 | Negative Meniscus | LaSF dense lanthanum flint class (806/409; S-LAH53 class) |
| L5 | Biconvex Positive | CaF2 fluorite crystal / fluorspar |
| L6 | Positive Meniscus | CaF2 fluorite crystal / fluorspar |
| L7 | Negative Meniscus | BK7 / S-BSL7 borosilicate crown class (516/641) |
| L8 | Biconcave Negative | Dense crown / SK class (643/584; S-BSM36 class) |
| L9 | Biconcave Negative | Dense crown / SK class (643/584; S-BSM36 class) |
| L10 | Positive Meniscus | SF6 / S-TIH6 dense flint class (805/254) |
| L11 | Biconvex Positive | K-SK14 / dense crown class (603/607) |
| L12 | Biconvex Positive | FK fluorosilicate crown class (487/701; N-FK5/S-FSL5 class) |
| L13 | Negative Meniscus | Dense lanthanum flint class (834/372) |
| L14 | Biconvex Positive | FK fluorosilicate crown class (487/701; N-FK5/S-FSL5 class) |
| L15 | Biconvex Positive | UD fluorophosphate crown class (497/813; S-FPL51/FCD1 class) |
| L16 | Negative Meniscus | Light flint / F8 class (596/392) |
| L17 | Biconcave Negative | Unmatched crown glass (534/555 vintage code) |
| L18 | Negative Meniscus | Lanthanum flint class (800/422) |
| L19 | Positive Meniscus | F2 flint class (620/363) |
Detailed analysis available in the interactive viewer above.