CANON EF 400mm f/2.8 L IS II USM — Optical Cross-Section & Ray Tracing

Home / Lenses / Canon / CANON EF 400mm f/2.8 L IS II USMCANON EF 400mm f/2.8 L IS II USMUS 2011/0090576 A1↗ — Shigenobu Sugita
15 ACTIVE ELEMENTS / 11 GROUPS (G FILTER EXCLUDED)
PATENT f = 392.15 mm; COMPUTED EFL 392.2607 mm
PATENT F/2.90 / MARKETED 400mm f/2.8
ALL-SPHERICAL
L16 IMAGEWARD INNER FOCUS; RECONSTRUCTED 2.7 m CLOSE STATE
L22 + L23 TRANSVERSE IS UNIT
Focus MechanismCONSTRAINED_RECONSTRUCTION: the patent publishes L16 imageward inner focusing but no finite-focus spacing table. Canon's 2.7 m MFD is treated as physical image-plane-referenced and normalized to the no-G model (patent Lt = 372.00 mm; modeled first-surface-to-IP track = 371.25 mm), giving an object-to-first-surface distance of 2328.00 mm. The close endpoint moves L16 +28.929493819 mm while holding D10 + D13 = 59.95 mm; it is reconstructed, not patent-published.
Optical Elements (15 physical)ElementTypeGlass
L11Biconvex Positive487702 class (vendor unresolved; multiple catalog equivalents)
L12Biconvex PositiveCaF2 fluorite (Canon production-correlation inference; patent Gp1 coordinates)
L13Biconcave Negative835427 class (vendor unresolved; multiple catalog equivalents)
L14Biconvex PositiveCaF2 fluorite (Canon production-correlation inference; patent Gp1 coordinates)
L15Negative Meniscus487702 class (vendor unresolved; multiple catalog equivalents)
L16aBiconvex Positive805254 class (vendor unresolved; multiple catalog equivalents)
L16bBiconcave Negative804466 class (vendor unresolved; multiple catalog equivalents)
L21aNegative Meniscus728285 class (vendor unresolved; multiple catalog equivalents)
L21bBiconvex Positive702412 class (vendor unresolved; multiple catalog equivalents)
L22aBiconvex Positive847238 class (vendor unresolved; multiple catalog equivalents)
L22bBiconcave Negative806409 class (vendor unresolved; multiple catalog equivalents)
L23Biconcave Negative835427 class (vendor unresolved; multiple catalog equivalents)
L24Biconvex Positive648338 class (vendor unresolved; multiple catalog equivalents)
L25aBiconvex Positive654397 anomalous-dispersion class (vendor unresolved; multiple catalog equivalents)
L25bBiconcave Negative808228 anomalous high-dispersion class (vendor unresolved; multiple catalog equivalents)

Element	Type	Glass
L11	Biconvex Positive	487702 class (vendor unresolved; multiple catalog equivalents)
L12	Biconvex Positive	CaF2 fluorite (Canon production-correlation inference; patent Gp1 coordinates)
L13	Biconcave Negative	835427 class (vendor unresolved; multiple catalog equivalents)
L14	Biconvex Positive	CaF2 fluorite (Canon production-correlation inference; patent Gp1 coordinates)
L15	Negative Meniscus	487702 class (vendor unresolved; multiple catalog equivalents)
L16a	Biconvex Positive	805254 class (vendor unresolved; multiple catalog equivalents)
L16b	Biconcave Negative	804466 class (vendor unresolved; multiple catalog equivalents)
L21a	Negative Meniscus	728285 class (vendor unresolved; multiple catalog equivalents)
L21b	Biconvex Positive	702412 class (vendor unresolved; multiple catalog equivalents)
L22a	Biconvex Positive	847238 class (vendor unresolved; multiple catalog equivalents)
L22b	Biconcave Negative	806409 class (vendor unresolved; multiple catalog equivalents)
L23	Biconcave Negative	835427 class (vendor unresolved; multiple catalog equivalents)
L24	Biconvex Positive	648338 class (vendor unresolved; multiple catalog equivalents)
L25a	Biconvex Positive	654397 anomalous-dispersion class (vendor unresolved; multiple catalog equivalents)
L25b	Biconcave Negative	808228 anomalous high-dispersion class (vendor unresolved; multiple catalog equivalents)