CANON FD 50mm f/1.2 L — Optical Cross-Section & Ray Tracing

Home / Lenses / Canon / CANON FD 50mm f/1.2 LCANON FD 50mm f/1.2 LUS 4,364,644 EXAMPLE 1 — IKEMORI / CANON K.K.
8 ELEMENTS / 6 GROUPS
f ≈ 50.0 mm
F/1.2
2ω = 46°
1 ASPHERICAL SURFACE
Focus MechanismSplit-unit focus: L1–L7 extend forward as a rigid assembly; L8 remains fixed relative to the camera mount. Only gap D12 (between R12 and R13) changes, increasing from 0.194 mm at infinity to ≈ 6.38 mm at MFD = 0.6 m.
Optical Elements (8)ElementTypeGlass
L1Positive MeniscusS-LAH65V (OHARA)
L2Positive Meniscus (1× Asph)S-LAM2 (OHARA)
L3Negative MeniscusOHARA S-TIM27 (636354)
L4Biconcave NegativeS-TIH6 / Schott SF6 (805254)
L5Biconvex PositiveOHARA S-LAH59 (816466)
L6Positive MeniscusTAFD30 (HOYA)
L7Biconvex PositiveS-LAH66 (OHARA)
L8Biconvex PositiveBACD15 (HOYA)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	S-LAH65V (OHARA)
L2	Positive Meniscus (1× Asph)	S-LAM2 (OHARA)
L3	Negative Meniscus	OHARA S-TIM27 (636354)
L4	Biconcave Negative	S-TIH6 / Schott SF6 (805254)
L5	Biconvex Positive	OHARA S-LAH59 (816466)
L6	Positive Meniscus	TAFD30 (HOYA)
L7	Biconvex Positive	S-LAH66 (OHARA)
L8	Biconvex Positive	BACD15 (HOYA)