TAMRON AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] MACRO (A18) — Optical Cross-Section & Ray Tracing

Home / Lenses / Tamron / TAMRON AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] MACRO (A18)TAMRON AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] MACRO (A18)JP 2008-003195 A↗, Example 2 — Yuichi Muramatsu, Akio Arakawa
16 ELEMENTS / 13 GROUPS
DESIGN f = 18.43–241.83 mm
DESIGN F/3.47–6.35
2 ASPHERICAL SURFACES / 2 ELEMENTS
2 HYBRID RESIN ASPHERES
Focus MechanismInner focus: the second group (G2) moves toward the object (paragraph 0083). The patent prints no travel, object distance or near-focus spacing, so the model stays at infinity focus and the focus slider changes nothing. 0.45 m is Tamron's stated minimum focus distance, not a modelled state.
Optical Elements (16 physical; 18 modeled media)ElementTypeGlass
L1Negative MeniscusS-TIH53 (OHARA catalog equivalent; production supplier unspecified)
L2Biconvex PositiveFCD1 (HOYA catalog equivalent; production supplier unspecified)
L3Positive MeniscusS-BSM15 (OHARA catalog equivalent; production supplier unspecified)
L4fHybrid Aspheric Resin Layer (1× Asph)Unmatched (hybrid optical resin; spectrum unpublished)
L4Negative MeniscusS-LAH65V (OHARA catalog equivalent; production supplier unspecified)
L5Biconcave NegativeTAFD5G (HOYA catalog equivalent; production supplier unspecified)
L6Biconvex PositiveS-TIH53 (OHARA catalog equivalent; production supplier unspecified)
L7Biconcave NegativeS-LAH58 (OHARA catalog equivalent; production supplier unspecified)
L8Negative MeniscusS-LAH65V (OHARA catalog equivalent; production supplier unspecified)
L9Biconvex PositiveS-BAL35 (OHARA catalog equivalent; production supplier unspecified)
L10Positive MeniscusS-FSL5 (OHARA catalog equivalent; production supplier unspecified)
L11Positive MeniscusFCD1 (HOYA catalog equivalent; production supplier unspecified)
L12Biconcave NegativeS-LAH60 (OHARA catalog equivalent; production supplier unspecified)
L13fHybrid Aspheric Resin Layer (1× Asph)Unmatched (hybrid optical resin; spectrum unpublished)
L13Biconvex PositiveS-FSL5 (OHARA catalog equivalent; production supplier unspecified)
L14Biconvex PositiveS-FSL5 (OHARA catalog equivalent; production supplier unspecified)
L15Biconcave NegativeS-LAH65V (OHARA catalog equivalent; production supplier unspecified)
L16Positive MeniscusS-TIL2 (OHARA catalog equivalent; production supplier unspecified)

Element	Type	Glass
L1	Negative Meniscus	S-TIH53 (OHARA catalog equivalent; production supplier unspecified)
L2	Biconvex Positive	FCD1 (HOYA catalog equivalent; production supplier unspecified)
L3	Positive Meniscus	S-BSM15 (OHARA catalog equivalent; production supplier unspecified)
L4f	Hybrid Aspheric Resin Layer (1× Asph)	Unmatched (hybrid optical resin; spectrum unpublished)
L4	Negative Meniscus	S-LAH65V (OHARA catalog equivalent; production supplier unspecified)
L5	Biconcave Negative	TAFD5G (HOYA catalog equivalent; production supplier unspecified)
L6	Biconvex Positive	S-TIH53 (OHARA catalog equivalent; production supplier unspecified)
L7	Biconcave Negative	S-LAH58 (OHARA catalog equivalent; production supplier unspecified)
L8	Negative Meniscus	S-LAH65V (OHARA catalog equivalent; production supplier unspecified)
L9	Biconvex Positive	S-BAL35 (OHARA catalog equivalent; production supplier unspecified)
L10	Positive Meniscus	S-FSL5 (OHARA catalog equivalent; production supplier unspecified)
L11	Positive Meniscus	FCD1 (HOYA catalog equivalent; production supplier unspecified)
L12	Biconcave Negative	S-LAH60 (OHARA catalog equivalent; production supplier unspecified)
L13f	Hybrid Aspheric Resin Layer (1× Asph)	Unmatched (hybrid optical resin; spectrum unpublished)
L13	Biconvex Positive	S-FSL5 (OHARA catalog equivalent; production supplier unspecified)
L14	Biconvex Positive	S-FSL5 (OHARA catalog equivalent; production supplier unspecified)
L15	Biconcave Negative	S-LAH65V (OHARA catalog equivalent; production supplier unspecified)
L16	Positive Meniscus	S-TIL2 (OHARA catalog equivalent; production supplier unspecified)