MEYER OPTIK GÖRLITZ DOUBLE-PLASMAT 135mm f/4.5 (patent model)

GB 135,853 A — Paul Rudolph

6 ELEMENTS / 4 GROUPS
PATENT REPRESENTATION 135mm f/4.5
COMPUTED EFL 133.960 mm
MODELED f/4.465
ALL SPHERICAL

Focus Mechanism

The patent gives one fixed prescription and no verified minimum focus distance. Bellows or camera-standard focusing is not modeled.

Optical Elements (6 physical)

ElementTypeGlass
L3′Biconvex PositiveUnmatched (621569 — historical D-line crown-class coordinate; supplier unresolved)
L2′Biconcave NegativeUnmatched (540473 — historical D-line low-index flint / LLF-FEL-class coordinate; supplier unresolved)
L1′Positive MeniscusUnmatched (622532 — historical D-line SSK/BSM-class coordinate; supplier unresolved)
L1Positive MeniscusUnmatched (622532 — historical D-line SSK/BSM-class coordinate; supplier unresolved)
L2Biconcave NegativeUnmatched (540473 — historical D-line low-index flint / LLF-FEL-class coordinate; supplier unresolved)
L3Biconvex PositiveUnmatched (621569 — historical D-line crown-class coordinate; supplier unresolved)