TAMRON 70-180mm f/2.8 Di III VC VXD G2 — Optical Cross-Section & Ray Tracing

Home / Lenses / Tamron / TAMRON 70-180mm f/2.8 Di III VC VXD G2TAMRON 70-180mm f/2.8 Di III VC VXD G2JP 2025-033505 A↗ — Hisayuki Yamanaka
20 ELEMENTS / 15 GROUPS
DESIGN f = 72.07–174.65 mm
DESIGN F/2.91
5 ASPHERICAL SURFACES / 3 ELEMENTS
1 XLD + 3 LD (INFERRED)
Focus MechanismInner focus by G4 (patent group F, cemented L17–L18): it moves toward the image from infinity to the published 0.85 m object-to-image states, by 2.27 / 6.46 / 12.67 mm at wide / middle / tele. Interpolated paths are not a factory cam law. Production 0.3 m wide-end spacings are unavailable.
Optical Elements (20 physical; 21 modeled media)ElementTypeGlass
L1Negative MeniscusNBFD15-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L2Biconvex PositiveFCD1 (HOYA coordinate-equivalent class; supplier unconfirmed)
L3Positive MeniscusFCD100 (HOYA coordinate-equivalent class; supplier unconfirmed)
L4Positive MeniscusNBFD30 (HOYA coordinate-equivalent class; supplier unconfirmed)
L5Negative MeniscusTAC6L (HOYA coordinate-equivalent class; supplier unconfirmed)
L6Negative MeniscusTAC8 (HOYA coordinate-equivalent class; supplier unconfirmed)
L7Positive MeniscusFDS90-SG (HOYA coordinate-equivalent class; supplier unconfirmed)
L8Negative MeniscusTAFD40L-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L9Positive MeniscusNBF1 (HOYA coordinate-equivalent class; supplier unconfirmed)
L10Negative MeniscusTAFD40L-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L11Positive MeniscusFCD515 (HOYA coordinate-equivalent class; supplier unconfirmed)
L12Biconcave NegativeJ-KZFH1 (HIKARI coordinate-equivalent class; supplier unconfirmed)
L13Positive MeniscusNBFD25 (HOYA coordinate-equivalent class; supplier unconfirmed)
L14Biconvex PositiveFCD515 (HOYA coordinate-equivalent class; supplier unconfirmed)
L15Biconcave NegativeTAFD32 (HOYA coordinate-equivalent class; supplier unconfirmed)
L16Biconvex Positive (2× Asph)Q-LASFH58S (HIKARI coordinate-equivalent class; supplier unconfirmed)
L17Biconvex PositiveE-FDS1-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L18Biconcave NegativeTAC8 (HOYA coordinate-equivalent class; supplier unconfirmed)
L19Biconvex Positive (2× Asph)M-BACD12 (HOYA coordinate-equivalent class; supplier unconfirmed)
L20rNegative Meniscus (1× Asph, resin)Unmatched (hybrid resin; no compatible HOYA coordinate)
L20Negative MeniscusTAFD25L (HOYA coordinate-equivalent class; supplier unconfirmed)

Element	Type	Glass
L1	Negative Meniscus	NBFD15-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L2	Biconvex Positive	FCD1 (HOYA coordinate-equivalent class; supplier unconfirmed)
L3	Positive Meniscus	FCD100 (HOYA coordinate-equivalent class; supplier unconfirmed)
L4	Positive Meniscus	NBFD30 (HOYA coordinate-equivalent class; supplier unconfirmed)
L5	Negative Meniscus	TAC6L (HOYA coordinate-equivalent class; supplier unconfirmed)
L6	Negative Meniscus	TAC8 (HOYA coordinate-equivalent class; supplier unconfirmed)
L7	Positive Meniscus	FDS90-SG (HOYA coordinate-equivalent class; supplier unconfirmed)
L8	Negative Meniscus	TAFD40L-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L9	Positive Meniscus	NBF1 (HOYA coordinate-equivalent class; supplier unconfirmed)
L10	Negative Meniscus	TAFD40L-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L11	Positive Meniscus	FCD515 (HOYA coordinate-equivalent class; supplier unconfirmed)
L12	Biconcave Negative	J-KZFH1 (HIKARI coordinate-equivalent class; supplier unconfirmed)
L13	Positive Meniscus	NBFD25 (HOYA coordinate-equivalent class; supplier unconfirmed)
L14	Biconvex Positive	FCD515 (HOYA coordinate-equivalent class; supplier unconfirmed)
L15	Biconcave Negative	TAFD32 (HOYA coordinate-equivalent class; supplier unconfirmed)
L16	Biconvex Positive (2× Asph)	Q-LASFH58S (HIKARI coordinate-equivalent class; supplier unconfirmed)
L17	Biconvex Positive	E-FDS1-W (HOYA coordinate-equivalent class; supplier unconfirmed)
L18	Biconcave Negative	TAC8 (HOYA coordinate-equivalent class; supplier unconfirmed)
L19	Biconvex Positive (2× Asph)	M-BACD12 (HOYA coordinate-equivalent class; supplier unconfirmed)
L20r	Negative Meniscus (1× Asph, resin)	Unmatched (hybrid resin; no compatible HOYA coordinate)
L20	Negative Meniscus	TAFD25L (HOYA coordinate-equivalent class; supplier unconfirmed)