SIGMA 28-105mm f/2.8 DG DN Art — Optical Cross-Section & Ray Tracing

Home / Lenses / Sigma / SIGMA 28-105mm f/2.8 DG DN ArtSIGMA 28-105mm f/2.8 DG DN ArtJP 2025-182227 A↗ — Takeshi Umeda
18 ELEMENTS / 13 GROUPS
SOURCE 28.55–102.37 mm
SOURCE F2.91
9 ASPHERICAL SURFACES / 5 ELEMENTS
Focus MechanismThe patent describes G5 moving toward the image for closer focus, but provides only infinity-focus zoom prescriptions. The production lens focuses to 0.40 m. Intermediate zoom positions are interpolated; they do not establish the production zoom or focus mechanism.
Optical Elements (18 physical)ElementTypeGlass
L1Negative MeniscusFDS90 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L2Biconvex PositiveFCD100 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L3Positive MeniscusTAFD34 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L4Negative Meniscus (2× Asph)M-TAF401 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L5Biconcave NegativeTAF1 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L6Biconvex PositiveS-NBH58 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)
L7Negative Meniscus (2× Asph)L-LAL13 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)
L8Biconvex Positive (2× Asph)L-LAL13 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)
L9Negative MeniscusBAFD8 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L10Biconvex PositiveFCD1 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L11Biconcave NegativeNBFD32 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L12Biconvex PositiveFCD100 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L13Biconvex Positive (2× Asph)M-PCD51 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L14Biconvex PositiveNBFD27 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L15Biconcave NegativeLAC14 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L16Biconvex PositivePCD40 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L17Biconcave NegativeTAFD35 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L18Positive Meniscus (1× Asph)L-TIM28 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)

Element	Type	Glass
L1	Negative Meniscus	FDS90 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L2	Biconvex Positive	FCD100 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L3	Positive Meniscus	TAFD34 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L4	Negative Meniscus (2× Asph)	M-TAF401 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L5	Biconcave Negative	TAF1 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L6	Biconvex Positive	S-NBH58 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)
L7	Negative Meniscus (2× Asph)	L-LAL13 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)
L8	Biconvex Positive (2× Asph)	L-LAL13 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)
L9	Negative Meniscus	BAFD8 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L10	Biconvex Positive	FCD1 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L11	Biconcave Negative	NBFD32 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L12	Biconvex Positive	FCD100 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L13	Biconvex Positive (2× Asph)	M-PCD51 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L14	Biconvex Positive	NBFD27 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L15	Biconcave Negative	LAC14 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L16	Biconvex Positive	PCD40 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L17	Biconcave Negative	TAFD35 (HOYA; nd, νd and printed PgF match; supplier unconfirmed)
L18	Positive Meniscus (1× Asph)	L-TIM28 (OHARA; nd, νd and printed PgF match; supplier unconfirmed)