CANON EF 70-200mm f/4 L USM — Optical Cross-Section & Ray Tracing

Home / Lenses / Canon / CANON EF 70-200mm f/4 L USMCANON EF 70-200mm f/4 L USMJP 2000-284174 A↗ — Akihiro Nishio
16 ELEMENTS / 13 GROUPS
70-200mm f/4 (MARKETED)
71.92-194.57mm f/4.1 (PATENT)
1 FLUORITE + 2 UD (PRODUCTION)
INNER FOCUS
Focus MechanismCONSTRAINED_RECONSTRUCTION: patent-published inner focus translates L1b (R3-R8) rigidly objectward. Close-focus D2/D8 endpoints are code-solved at Canon's 1.2 m MFD with the fixed common image plane; D2 decreases by the same amount D8 increases. D15 and D18 are zoom-only.
Optical Elements (16 physical)ElementTypeGlass
E1Positive MeniscusS-FSL5 (OHARA) class
E2Negative MeniscusS-TIH18 (OHARA) class
E3Positive MeniscusSynthetic fluorite (CaF2) coordinate-compatible spectral surrogate; material inferred
E4Biconvex PositiveS-FPL51 (OHARA) / FCD1-class UD glass
E5Biconcave Negative804466 LASF class (HIKARI J-LASF015 spectral surrogate)
E6Biconcave NegativeS-BSL7 (OHARA) / N-BK7 class
E7Biconvex PositiveS-TIH53WN (OHARA) class; current spectral surrogate
E8Negative MeniscusLAFN7 (SCHOTT) coordinate-compatible spectral surrogate; supplier unspecified
E9Biconvex PositiveS-BSM15 (OHARA) class
E10Negative Meniscus762401 lanthanum-flint class (OHARA S-LAM55 spectral surrogate)
E11Biconvex Positive603607 barium-crown class (OHARA S-BSM14 spectral surrogate)
E12Biconvex PositiveS-FPL51 (OHARA) / FCD1-class UD glass
E13Biconcave NegativeJ-LASF013 (HIKARI) coordinate-compatible spectral surrogate; supplier unspecified
E14Biconvex Positive603607 barium-crown class (OHARA S-BSM14 spectral surrogate)
E15Negative Meniscus697555 lanthanum-crown class (OHARA S-LAL14 spectral surrogate)
E16Biconvex Positive593353 flint class (OHARA S-FTM16 spectral surrogate)
TeleconvertersCANON EXTENDER EF2X

Element	Type	Glass
E1	Positive Meniscus	S-FSL5 (OHARA) class
E2	Negative Meniscus	S-TIH18 (OHARA) class
E3	Positive Meniscus	Synthetic fluorite (CaF2) coordinate-compatible spectral surrogate; material inferred
E4	Biconvex Positive	S-FPL51 (OHARA) / FCD1-class UD glass
E5	Biconcave Negative	804466 LASF class (HIKARI J-LASF015 spectral surrogate)
E6	Biconcave Negative	S-BSL7 (OHARA) / N-BK7 class
E7	Biconvex Positive	S-TIH53WN (OHARA) class; current spectral surrogate
E8	Negative Meniscus	LAFN7 (SCHOTT) coordinate-compatible spectral surrogate; supplier unspecified
E9	Biconvex Positive	S-BSM15 (OHARA) class
E10	Negative Meniscus	762401 lanthanum-flint class (OHARA S-LAM55 spectral surrogate)
E11	Biconvex Positive	603607 barium-crown class (OHARA S-BSM14 spectral surrogate)
E12	Biconvex Positive	S-FPL51 (OHARA) / FCD1-class UD glass
E13	Biconcave Negative	J-LASF013 (HIKARI) coordinate-compatible spectral surrogate; supplier unspecified
E14	Biconvex Positive	603607 barium-crown class (OHARA S-BSM14 spectral surrogate)
E15	Negative Meniscus	697555 lanthanum-crown class (OHARA S-LAL14 spectral surrogate)
E16	Biconvex Positive	593353 flint class (OHARA S-FTM16 spectral surrogate)