SCHNEIDER-KREUZNACH TV-VARIOGON 20-600mm f/2.1-6.6

US 3,912,373 — Karl Macher

31 ELEMENTS / 22 GROUPS
20-600mm MARKETED; 20-592mm SOURCE STATIONS ×20
MARKETED f/2.1-6.6
ALL-SPHERICAL
TWO-STAGE 30× ZOOM

Focus Mechanism

Only infinity-focus zoom states are modeled; the patent describes L1 focusing without numerical travel. The 0.85 m close-focus value is secondary product metadata.

Optical Elements (31 physical)

ElementTypeGlass
L1Biconcave NegativeN-LAK21 — native e-line compatible spectral proxy (supplier unresolved)
L2Biconcave NegativeN-LAK21 — native e-line compatible spectral proxy (supplier unresolved)
L3Biconvex PositiveN-SF8 — native e-line compatible spectral proxy (supplier unresolved)
L4Biconvex PositiveLAC12 — native e-line compatible spectral proxy (supplier unresolved)
L5Biconcave NegativeS-TIH23 — native e-line compatible spectral proxy (supplier unresolved)
L6Biconvex PositiveN-LAK21 — native e-line compatible spectral proxy (supplier unresolved)
L7Biconvex PositiveN-LAK21 — native e-line compatible spectral proxy (supplier unresolved)
L8Positive MeniscusN-LAK21 — native e-line compatible spectral proxy (supplier unresolved)
L9Negative MeniscusN-LAF21 — native e-line compatible spectral proxy (supplier unresolved)
L10Positive MeniscusSF4 — native e-line compatible spectral proxy (supplier unresolved)
L11Biconcave NegativeN-LAK8 — native e-line compatible spectral proxy (supplier unresolved)
L12Positive MeniscusSF1 — native e-line compatible spectral proxy (supplier unresolved)
L13Biconcave NegativeN-LAK8 — native e-line compatible spectral proxy (supplier unresolved)
L14Biconvex PositiveS-TIH18 — native e-line compatible spectral proxy (supplier unresolved)
L15Biconvex PositiveK10 — native e-line compatible spectral proxy (supplier unresolved)
L16Biconvex PositiveK10 — native e-line compatible spectral proxy (supplier unresolved)
L17Biconvex PositiveBSC3 — native e-line compatible spectral proxy (supplier unresolved)
L18Negative MeniscusSF4 — native e-line compatible spectral proxy (supplier unresolved)
L19Positive MeniscusSF4 — native e-line compatible spectral proxy (supplier unresolved)
L20Biconcave NegativeS-TIH10 — native e-line compatible spectral proxy (supplier unresolved)
L21Biconvex PositiveSF4 — native e-line compatible spectral proxy (supplier unresolved)
L22Biconcave NegativeN-LAF21 — native e-line compatible spectral proxy (supplier unresolved)
L23Biconcave NegativeN-LAF21 — native e-line compatible spectral proxy (supplier unresolved)
L24Biconvex PositiveN-FK5 — native e-line compatible spectral proxy (supplier unresolved)
L25Biconvex PositiveN-FK5 — native e-line compatible spectral proxy (supplier unresolved)
L26Negative MeniscusN-SF8 — native e-line compatible spectral proxy (supplier unresolved)
L27Positive MeniscusN-FK5 — native e-line compatible spectral proxy (supplier unresolved)
L28Negative MeniscusN-LAF21 — native e-line compatible spectral proxy (supplier unresolved)
L29Biconcave NegativeN-LAF21 — native e-line compatible spectral proxy (supplier unresolved)
L30Biconvex PositiveN-FK5 — native e-line compatible spectral proxy (supplier unresolved)
L31Positive MeniscusN-FK5 — native e-line compatible spectral proxy (supplier unresolved)