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

Home / Lenses / Canon / CANON 50mm f/1.2CANON 50mm f/1.2US 2,836,102↗, Example 2 — Hiroshi Ito
7 ELEMENTS / 5 GROUPS
50 mm (DESIGN 50.513 mm)
F/1.2
2ω = 40°
ALL-SPHERICAL
Focus MechanismUnit focusing: the complete objective translates; the model varies only the rear BFD.
Optical Elements (7 physical)ElementTypeGlass
L1Positive MeniscusLAC13 (HOYA) class (694535 lanthanum crown; nd-exact, Δνd −0.16; H-LaK6A / S-LAL13 share the coordinate)
L2Positive MeniscusS-LAM3 (OHARA; 717479 coordinate equivalent, original Canon melt not identified)
L3Biconvex PositiveK-SK18 (Sumita; 639555 exact coordinate equivalent, original Canon melt not identified)
L4Biconcave NegativeS-TIH1 (OHARA; 717295 coordinate equivalent, original Canon melt not identified)
L5Biconcave NegativeS-NSL36 (OHARA; 517524 close coordinate equivalent to patent 517525, original Canon melt not identified)
L6Biconvex PositiveLAC13 (HOYA) class (694535 lanthanum crown; nd-exact, Δνd −0.16; H-LaK6A / S-LAL13 share the coordinate)
L7Biconvex PositiveLAC13 (HOYA) class (694535 lanthanum crown; nd-exact, Δνd −0.16; H-LaK6A / S-LAL13 share the coordinate)

Element	Type	Glass
L1	Positive Meniscus	LAC13 (HOYA) class (694535 lanthanum crown; nd-exact, Δνd −0.16; H-LaK6A / S-LAL13 share the coordinate)
L2	Positive Meniscus	S-LAM3 (OHARA; 717479 coordinate equivalent, original Canon melt not identified)
L3	Biconvex Positive	K-SK18 (Sumita; 639555 exact coordinate equivalent, original Canon melt not identified)
L4	Biconcave Negative	S-TIH1 (OHARA; 717295 coordinate equivalent, original Canon melt not identified)
L5	Biconcave Negative	S-NSL36 (OHARA; 517524 close coordinate equivalent to patent 517525, original Canon melt not identified)
L6	Biconvex Positive	LAC13 (HOYA) class (694535 lanthanum crown; nd-exact, Δνd −0.16; H-LaK6A / S-LAL13 share the coordinate)
L7	Biconvex Positive	LAC13 (HOYA) class (694535 lanthanum crown; nd-exact, Δνd −0.16; H-LaK6A / S-LAL13 share the coordinate)