CANON 8.8-220mm f/2.8-5.6 (Canon PowerShot G3 X) — Optical Cross-Section & Ray Tracing

Home / Lenses / Canon / CANON 8.8-220mm f/2.8-5.6 (Canon PowerShot G3 X)CANON 8.8-220mm f/2.8-5.6 (Canon PowerShot G3 X)JP 2016-148731 A↗, Numerical Example 6 — Takashi Okada
18 ELEMENTS / 13 OPTICAL GROUPS
6 KINEMATIC ZOOM GROUPS
DESIGN 9.06–213.40mm
DESIGN f/2.88–5.77
5 ASPHERICAL SURFACES
Focus MechanismNO_INTERNAL_RECONSTRUCTION: JP 2016-148731 A Example 6 publishes B6 as the focus group but gives no finite-object spacing row. All focus vectors preserve the infinity-focus W/M/T states. Canon markets 0.05 m at wide and 0.85 m at tele; closeFocusM records the wide-end product minimum only and is not used to infer B6 travel.
Optical Elements (18 physical)ElementTypeGlass
L1Negative Meniscus911353 class (vendor unresolved)
L2Biconvex PositiveS-FPL51 (coordinate-compatible spectral proxy; production supplier unspecified)
L3Positive MeniscusS-FPL51 (coordinate-compatible spectral proxy; production supplier unspecified)
L4Negative Meniscus835427 class (vendor unresolved)
L5Biconcave Negative (1× Asph)S-BAL42 (coordinate-compatible spectral proxy; production supplier unspecified)
L6Biconvex Positive946180 high-dispersion-flint class (vendor unresolved)
L7Biconvex Positive (2× Asph)851401 class (vendor unresolved)
L8Biconvex PositiveS-LAL13 (coordinate-compatible spectral proxy; production supplier unspecified)
L9Biconcave Negative001291 high-index-lanthanum class (vendor unresolved)
L10Biconvex Positive603606 crown class (vendor unresolved)
L11Biconcave Negative (1× Asph)851401 class (vendor unresolved)
L12Positive MeniscusS-TIH6 (coordinate-compatible spectral proxy; production supplier unspecified)
L13Biconvex Positive593686 low-dispersion-crown class (vendor unresolved)
L14Negative Meniscus001291 high-index-lanthanum class (vendor unresolved)
L15Biconvex Positive517524 crown class (vendor unresolved)
L16Biconvex Positive487702 low-dispersion-crown class (vendor unresolved)
L17Negative Meniscus (1× Asph)851401 class (vendor unresolved)
L18Positive Meniscus699301 flint class (vendor unresolved)

Element	Type	Glass
L1	Negative Meniscus	911353 class (vendor unresolved)
L2	Biconvex Positive	S-FPL51 (coordinate-compatible spectral proxy; production supplier unspecified)
L3	Positive Meniscus	S-FPL51 (coordinate-compatible spectral proxy; production supplier unspecified)
L4	Negative Meniscus	835427 class (vendor unresolved)
L5	Biconcave Negative (1× Asph)	S-BAL42 (coordinate-compatible spectral proxy; production supplier unspecified)
L6	Biconvex Positive	946180 high-dispersion-flint class (vendor unresolved)
L7	Biconvex Positive (2× Asph)	851401 class (vendor unresolved)
L8	Biconvex Positive	S-LAL13 (coordinate-compatible spectral proxy; production supplier unspecified)
L9	Biconcave Negative	001291 high-index-lanthanum class (vendor unresolved)
L10	Biconvex Positive	603606 crown class (vendor unresolved)
L11	Biconcave Negative (1× Asph)	851401 class (vendor unresolved)
L12	Positive Meniscus	S-TIH6 (coordinate-compatible spectral proxy; production supplier unspecified)
L13	Biconvex Positive	593686 low-dispersion-crown class (vendor unresolved)
L14	Negative Meniscus	001291 high-index-lanthanum class (vendor unresolved)
L15	Biconvex Positive	517524 crown class (vendor unresolved)
L16	Biconvex Positive	487702 low-dispersion-crown class (vendor unresolved)
L17	Negative Meniscus (1× Asph)	851401 class (vendor unresolved)
L18	Positive Meniscus	699301 flint class (vendor unresolved)