CANON EF 28mm f/2.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Canon / CANON EF 28mm f/2.8CANON EF 28mm f/2.8JP S62-078520 A↗ — Takashi Matsushita
5 ELEMENTS / 5 GROUPS
f = 28.219 mm (MODELED)
F/2.8
2ω = 74°
1 ASPHERICAL SURFACE
MFD 0.3 m / 0.13×
Focus MechanismNO_INTERNAL_RECONSTRUCTION: the patent publishes only one infinity prescription and no moving-group or spacing states; the production 0.3 m MFD is retained as metadata without invented internal motion.
Optical Elements (5 physical)ElementTypeGlass
L1Negative Meniscus (1× Asph)S-BSM14 (OHARA catalog equivalent; patent class 603607)
L2Biconvex PositiveS-LAH51 (OHARA catalog equivalent; patent class 786442)
L3Biconcave NegativeS-TIH53WN (OHARA catalog equivalent; patent class 847239)
L4Biconvex PositiveS-LAH52 (OHARA catalog equivalent; patent class 800422)
L5Biconvex PositiveS-LAH51 (OHARA catalog equivalent; patent class 786442)

Element	Type	Glass
L1	Negative Meniscus (1× Asph)	S-BSM14 (OHARA catalog equivalent; patent class 603607)
L2	Biconvex Positive	S-LAH51 (OHARA catalog equivalent; patent class 786442)
L3	Biconcave Negative	S-TIH53WN (OHARA catalog equivalent; patent class 847239)
L4	Biconvex Positive	S-LAH52 (OHARA catalog equivalent; patent class 800422)
L5	Biconvex Positive	S-LAH51 (OHARA catalog equivalent; patent class 786442)