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

Home / Lenses / Canon / CANON EF 28mm f/2.8 IS USMCANON EF 28mm f/2.8 IS USMJP 2013-054269 A↗ — Makoto Nakahara
9 ELEMENTS / 7 GROUPS
DESIGN f = 28.60 mm
DESIGN F/2.86
2ω = 74.22°
1 ASPHERICAL SURFACE
OPTICAL IMAGE STABILIZATION
Focus MechanismCONSTRAINED_RECONSTRUCTION: patent-disclosed rigid rear focus. L2 (surfaces 6-18, including STO and Gis) moves 6.067660 mm objectward at the modeled 0.23 m state; D5 decreases as BF increases by the same amount.
Optical Elements (9 physical)ElementTypeGlass
L1Negative Meniscus603606/603607 crown class (catalog vendor unresolved)
L2Biconvex Positive773496 lanthanum crown class (catalog vendor unresolved)
L3Negative Meniscus487702 low-index crown class (catalog vendor unresolved)
L4Biconvex Positive911353 high-index lanthanum class (catalog vendor unresolved)
L5Biconcave Negative738323 flint class (catalog vendor unresolved)
GisBiconvex Positive729547 lanthanum crown class (catalog vendor unresolved)
L7Negative Meniscus740283 dense-flint class (catalog vendor unresolved)
L8Positive Meniscus697555 lanthanum crown class (catalog vendor unresolved)
L9Pos. Meniscus (1× Asph)583594 molded-crown class (catalog vendor unresolved)

Element	Type	Glass
L1	Negative Meniscus	603606/603607 crown class (catalog vendor unresolved)
L2	Biconvex Positive	773496 lanthanum crown class (catalog vendor unresolved)
L3	Negative Meniscus	487702 low-index crown class (catalog vendor unresolved)
L4	Biconvex Positive	911353 high-index lanthanum class (catalog vendor unresolved)
L5	Biconcave Negative	738323 flint class (catalog vendor unresolved)
Gis	Biconvex Positive	729547 lanthanum crown class (catalog vendor unresolved)
L7	Negative Meniscus	740283 dense-flint class (catalog vendor unresolved)
L8	Positive Meniscus	697555 lanthanum crown class (catalog vendor unresolved)
L9	Pos. Meniscus (1× Asph)	583594 molded-crown class (catalog vendor unresolved)