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

Home / Lenses / Canon / CANON EF 50mm f/1.2 L USMCANON EF 50mm f/1.2 L USMJP 2007-333790 A↗, Numerical Example 1 — Makoto Mitsusaka
8 ELEMENTS / 6 GROUPS
DESIGN EFL ≈ 51.695 mm
DESIGN F/1.25
2ω = 45.4°
1 ASPHERICAL SURFACE
Focus MechanismThe whole optical unit moves toward the object for closer focus. The 7.07 mm travel to 0.45 m is reconstructed; the patent specifies unit focusing but gives no close-focus spacing table.
Optical Elements (8 physical)ElementTypeGlass
L1Positive Meniscus773496 — source-coordinate glass class (vendor not identified)
L2Positive Meniscus835427 — source-coordinate glass class (vendor not identified)
L3Negative MeniscusS-TIM27 — catalog-equivalent curve for patent 640345 (production supplier unspecified)
L4Biconcave Negative728285 — source-coordinate glass class (vendor not identified)
L5Biconvex Positive883408 — source-coordinate glass class (vendor not identified)
L6Biconcave Negative699301 — source-coordinate glass class (vendor not identified)
L7Biconvex Positive835427 — source-coordinate glass class (vendor not identified)
L8Biconvex Positive (1× Asph)804466 — source-coordinate glass class (vendor not identified)

Element	Type	Glass
L1	Positive Meniscus	773496 — source-coordinate glass class (vendor not identified)
L2	Positive Meniscus	835427 — source-coordinate glass class (vendor not identified)
L3	Negative Meniscus	S-TIM27 — catalog-equivalent curve for patent 640345 (production supplier unspecified)
L4	Biconcave Negative	728285 — source-coordinate glass class (vendor not identified)
L5	Biconvex Positive	883408 — source-coordinate glass class (vendor not identified)
L6	Biconcave Negative	699301 — source-coordinate glass class (vendor not identified)
L7	Biconvex Positive	835427 — source-coordinate glass class (vendor not identified)
L8	Biconvex Positive (1× Asph)	804466 — source-coordinate glass class (vendor not identified)