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

Home / Lenses / Tamron / TAMRON 70-180mm f/2.8 Di III VXDTAMRON 70-180mm f/2.8 Di III VXDJP 2021-43375 A↗ — Wataru Kusaka
19 ELEMENTS / 14 GROUPS
70-180mm f/2.8 MARKETED
72.102-174.600mm PUBLISHED DESIGN STATES
f/2.910 MODELED DESIGN APERTURE
4 ASPHERICAL SURFACES
PUBLISHED DUAL-GROUP FLOATING FOCUS
Focus MechanismPUBLISHED two-group floating focus: Gf moves imageward and G6 moves objectward from infinity to the patent's 850 mm shooting-distance state at each zoom position; no internal reconstruction is used.
Optical Elements (19 physical; 21 modeled media)ElementTypeGlass
L1Negative Meniscus806333 — high-index optical glass (vendor unresolved)
L2Biconvex Positive437951 — ultra-low-dispersion crown (vendor unresolved)
L3Biconvex Positive497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L4Biconcave Negative697555 — lanthanum-crown class (vendor unresolved)
L5Biconcave Negative497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L6Positive Meniscus923209 — ultra-high-index dense-flint class (vendor unresolved)
L7Biconcave Negative697555 — lanthanum-crown class (vendor unresolved)
L8aBonded Aspheric LayerUnmatched (bonded aspheric optical layer; physical material not identified by patent)
L8Biconvex Positive Substrate835427 — high-index lanthanum-glass class (vendor unresolved)
L9Biconvex Positive593686 — low-dispersion crown class (vendor unresolved)
L10Biconvex Positive497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L11Biconcave Negative855252 — high-index flint class (vendor unresolved)
L12Plano-Concave Negative904313 — high-index lanthanum/flint class (vendor unresolved)
L13Biconvex Positive497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L14Biconvex Positive603380 — F5/TIM5-class flint (vendor unresolved)
L15Biconvex Positive923209 — ultra-high-index dense-flint class (vendor unresolved)
L16Biconcave Negative773496 — lanthanum-flint class (vendor unresolved)
L17aBonded Aspheric LayerUnmatched (bonded aspheric optical layer; physical material not identified by patent)
L17Negative Meniscus Substrate855252 — high-index flint class (vendor unresolved)
L18Biconvex Positive911353 — high-index optical glass (vendor unresolved)
L19Negative Meniscus (2× Asph)851401 — high-index optical glass (vendor unresolved)

Element	Type	Glass
L1	Negative Meniscus	806333 — high-index optical glass (vendor unresolved)
L2	Biconvex Positive	437951 — ultra-low-dispersion crown (vendor unresolved)
L3	Biconvex Positive	497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L4	Biconcave Negative	697555 — lanthanum-crown class (vendor unresolved)
L5	Biconcave Negative	497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L6	Positive Meniscus	923209 — ultra-high-index dense-flint class (vendor unresolved)
L7	Biconcave Negative	697555 — lanthanum-crown class (vendor unresolved)
L8a	Bonded Aspheric Layer	Unmatched (bonded aspheric optical layer; physical material not identified by patent)
L8	Biconvex Positive Substrate	835427 — high-index lanthanum-glass class (vendor unresolved)
L9	Biconvex Positive	593686 — low-dispersion crown class (vendor unresolved)
L10	Biconvex Positive	497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L11	Biconcave Negative	855252 — high-index flint class (vendor unresolved)
L12	Plano-Concave Negative	904313 — high-index lanthanum/flint class (vendor unresolved)
L13	Biconvex Positive	497816 — fluorophosphate low-dispersion crown (vendor unresolved)
L14	Biconvex Positive	603380 — F5/TIM5-class flint (vendor unresolved)
L15	Biconvex Positive	923209 — ultra-high-index dense-flint class (vendor unresolved)
L16	Biconcave Negative	773496 — lanthanum-flint class (vendor unresolved)
L17a	Bonded Aspheric Layer	Unmatched (bonded aspheric optical layer; physical material not identified by patent)
L17	Negative Meniscus Substrate	855252 — high-index flint class (vendor unresolved)
L18	Biconvex Positive	911353 — high-index optical glass (vendor unresolved)
L19	Negative Meniscus (2× Asph)	851401 — high-index optical glass (vendor unresolved)