CANON RF 50mm f/1.2 L USM

US 2019/0265441 A1, Numerical Data 2 — 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
ONE LOW-DISPERSION SOURCE MEDIUM; PROXY APD INFERRED

Focus Mechanism

Front-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 compatible catalog proxy; supplier/melt unspecified)
G2Biconcave NegativeS-TIM28 (OHARA compatible catalog proxy; supplier/melt unspecified)
G3Positive MeniscusS-LAH99 (OHARA compatible catalog proxy; source nd/vd pair, supplier/melt unspecified)
G4Negative MeniscusS-NBH5 (OHARA compatible catalog proxy; supplier/melt unspecified)
G5Biconcave NegativeH-ZBaF4 (CDGM nearest-coordinate spectral proxy; source pair retained, supplier/melt unspecified)
G6Positive MeniscusS-LAH98 (OHARA compatible catalog proxy; source nd/vd pair, supplier/melt unspecified)
G7Positive MeniscusS-FPL51 (OHARA compatible catalog proxy; supplier/melt unspecified)
G8Biconcave NegativeS-NBH53 (OHARA compatible catalog proxy; source nd/vd pair, supplier/melt unspecified)
G9Biconvex PositiveS-LAH96 (OHARA compatible catalog proxy; source nd/vd pair, supplier/melt unspecified)
G10Biconcave NegativeH-ZBaF4 (CDGM nearest-coordinate spectral proxy; source pair retained, supplier/melt unspecified)
G11Biconvex Positive (1× Asph)S-LAH58 / TAFD30 (compatible catalog proxies; supplier/melt unspecified)
G12Biconvex PositiveS-LAH58 / TAFD30 (compatible catalog proxies; supplier/melt unspecified)
G13Biconcave NegativeS-TIM8 (OHARA compatible catalog proxy; supplier/melt unspecified)
G14Biconcave NegativeS-NBH52 (OHARA compatible catalog proxy; supplier/melt unspecified)
G15Biconvex Positive (1× Asph)S-LAH65V / L-LAH65V (OHARA compatible catalog proxies; supplier/melt unspecified)