SCHNEIDER-KREUZNACH VARIOGON 10-40mm f/2.8

US 3,057,257 — Günter Klemt, Karl Macher

13 ELEMENTS / 9 GROUPS
10-40mm
f/2.8
NORMAL-8 CORRELATION
ALL SPHERICAL

Focus Mechanism

Front-group focusing is source-documented; no finite-focus internal spacing is reconstructed.

Optical Elements (13 physical)

ElementTypeGlass
L1Biconvex PositivePC3 — coordinate-compatible spectral proxy (supplier unresolved)
L2Biconvex PositiveS-BSM16 — coordinate-compatible spectral proxy (supplier unresolved)
L3Biconcave NegativeS-TIH14 — coordinate-compatible spectral proxy (supplier unresolved)
L4Positive MeniscusE-FD4 — coordinate-compatible spectral proxy (supplier unresolved)
L5Biconcave NegativePC1 — coordinate-compatible spectral proxy (supplier unresolved)
L6Biconcave NegativePC1 — coordinate-compatible spectral proxy (supplier unresolved)
L7Positive MeniscusE-FD4 — coordinate-compatible spectral proxy (supplier unresolved)
L8Biconvex PositiveS-BSM16 — coordinate-compatible spectral proxy (supplier unresolved)
L9Negative MeniscusF2 — coordinate-compatible spectral proxy (supplier unresolved)
L10Biconvex PositiveS-BSM16 — coordinate-compatible spectral proxy (supplier unresolved)
L11Positive MeniscusS-BSM16 — coordinate-compatible spectral proxy (supplier unresolved)
L12Biconcave NegativeE-FD15 — coordinate-compatible spectral proxy (supplier unresolved)
L13Biconvex PositiveK-LaK11 — coordinate-compatible spectral proxy (supplier unresolved)