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

Home / Lenses / Canon / CANON RF 50mm f/1.2 L USMCANON RF 50mm f/1.2 L USMUS 2019/0265441 A1↗ — Masato Katayose
15 ELEMENTS / 9 GROUPS
f ≈ 51.1 mm (marketed 50 mm)
F/1.25 (marketed F/1.2)
2ω ≈ 45.9°
3 ASPHERICAL SURFACES
1 UD ELEMENT (S-FPL51)
Focus MechanismFront-group extension focus: L1 (G1–G11 + stop) translates toward object; L2 (G12–G15) stationary. Single variable gap (d19); BFD constant. Ring-type USM.
Optical Elements (15 physical)ElementTypeGlass
G1Biconvex Positive (1× Asph)S-LAH65V (OHARA)
G2Biconcave NegativeS-TIM28 (OHARA)
G3Positive MeniscusS-LAH99 (OHARA catalog-equivalent to patent 001291; supplier not identified)
G4Negative MeniscusS-NBH5 (OHARA)
G5Biconcave NegativeH-ZBaF4 catalog equivalent (patent 666356; production supplier unspecified)
G6Positive Meniscus954323 — ultra-high-index dense flint (nd=1.95375, νd=32.32)
G7Positive MeniscusS-FPL51 (OHARA)
G8Biconcave Negative738323 — niobium dense flint (nd=1.73800, νd=32.26)
G9Biconvex Positive764485 — lanthanum crown (nd=1.76385, νd=48.51)
G10Biconcave NegativeH-ZBaF4 catalog equivalent (patent 666356; production supplier unspecified)
G11Biconvex Positive (1× Asph)S-LAH58 / TAFD30 class (883408)
G12Biconvex PositiveS-LAH58 / TAFD30 class (883408)
G13Biconcave NegativeS-TIM8 (OHARA catalog equivalent; production glass unspecified)
G14Biconcave NegativeS-NBH52 (OHARA)
G15Biconvex Positive (1× Asph)S-LAH65V / L-LAH65V (OHARA)

Element	Type	Glass
G1	Biconvex Positive (1× Asph)	S-LAH65V (OHARA)
G2	Biconcave Negative	S-TIM28 (OHARA)
G3	Positive Meniscus	S-LAH99 (OHARA catalog-equivalent to patent 001291; supplier not identified)
G4	Negative Meniscus	S-NBH5 (OHARA)
G5	Biconcave Negative	H-ZBaF4 catalog equivalent (patent 666356; production supplier unspecified)
G6	Positive Meniscus	954323 — ultra-high-index dense flint (nd=1.95375, νd=32.32)
G7	Positive Meniscus	S-FPL51 (OHARA)
G8	Biconcave Negative	738323 — niobium dense flint (nd=1.73800, νd=32.26)
G9	Biconvex Positive	764485 — lanthanum crown (nd=1.76385, νd=48.51)
G10	Biconcave Negative	H-ZBaF4 catalog equivalent (patent 666356; production supplier unspecified)
G11	Biconvex Positive (1× Asph)	S-LAH58 / TAFD30 class (883408)
G12	Biconvex Positive	S-LAH58 / TAFD30 class (883408)
G13	Biconcave Negative	S-TIM8 (OHARA catalog equivalent; production glass unspecified)
G14	Biconcave Negative	S-NBH52 (OHARA)
G15	Biconvex Positive (1× Asph)	S-LAH65V / L-LAH65V (OHARA)