SIGMA 28mm f/1.4 DG HSM | Art — Optical Cross-Section & Ray Tracing

Home / Lenses / Sigma / SIGMA 28mm f/1.4 DG HSM | ArtSIGMA 28mm f/1.4 DG HSM | ArtJP 2019-219472 A↗ — Hokuto Usami, Kenta Fujita
17 ELEMENTS / 12 GROUPS
DESIGN f = 28.72 mm
DESIGN F/1.46
6 ASPHERICAL SURFACES / 3 ELEMENTS
Focus MechanismRear focus between the two states the patent publishes, infinity and 1.275 m. Group L2 (surfaces 15–30, including the stop) moves 0.7338 mm toward the object; group L1, the LPF and the image plane stay fixed. Spacings between the two states are interpolated. The production 0.28 m minimum focus is not reconstructed.
Optical Elements (17 physical)ElementTypeGlass
E1Negative MeniscusS-LAH96 (OHARA coordinate equivalent, 764485; supplier unconfirmed)
E2Neg. Meniscus (2× Asph)M-PCD51 (HOYA coordinate equivalent, 592670; supplier unconfirmed)
E3Biconvex PositiveTAFD45L (HOYA coordinate equivalent, 954323; supplier unconfirmed)
E4Biconcave NegativeFCD100 (HOYA coordinate equivalent, 437951; supplier unconfirmed)
E5Biconvex PositiveTAFD35L (HOYA coordinate equivalent, 911353; supplier unconfirmed)
E6Biconcave NegativeS-NBH53V (OHARA coordinate equivalent, 738323; supplier unconfirmed)
E7Biconvex PositiveFCD515 (HOYA coordinate equivalent, 593686; supplier unconfirmed)
E8Biconvex PositiveTAF3D (HOYA coordinate equivalent, 804465; supplier unconfirmed)
E9Biconvex PositiveS-LAH96 (OHARA coordinate equivalent, 764485; supplier unconfirmed)
E10Biconvex Positive (2× Asph)M-TAF101 (HOYA coordinate equivalent, 768492; supplier unconfirmed)
E11Biconvex PositiveE-FDS1-W (HOYA coordinate equivalent, 923209; supplier unconfirmed)
E12Biconcave NegativeS-NBH53V (OHARA coordinate equivalent, 738323; supplier unconfirmed)
E13Positive MeniscusFCD10A (HOYA coordinate equivalent, 459902; supplier unconfirmed)
E14Biconcave NegativeS-NBH53V (OHARA coordinate equivalent, 738323; supplier unconfirmed)
E15Biconvex PositiveFCD1 (HOYA coordinate equivalent, 497816; supplier unconfirmed)
E16Biconvex PositiveFCD515 (HOYA coordinate equivalent, 593686; supplier unconfirmed)
E17Pos. Meniscus (2× Asph)M-TAF101 (HOYA coordinate equivalent, 768492; supplier unconfirmed)

Element	Type	Glass
E1	Negative Meniscus	S-LAH96 (OHARA coordinate equivalent, 764485; supplier unconfirmed)
E2	Neg. Meniscus (2× Asph)	M-PCD51 (HOYA coordinate equivalent, 592670; supplier unconfirmed)
E3	Biconvex Positive	TAFD45L (HOYA coordinate equivalent, 954323; supplier unconfirmed)
E4	Biconcave Negative	FCD100 (HOYA coordinate equivalent, 437951; supplier unconfirmed)
E5	Biconvex Positive	TAFD35L (HOYA coordinate equivalent, 911353; supplier unconfirmed)
E6	Biconcave Negative	S-NBH53V (OHARA coordinate equivalent, 738323; supplier unconfirmed)
E7	Biconvex Positive	FCD515 (HOYA coordinate equivalent, 593686; supplier unconfirmed)
E8	Biconvex Positive	TAF3D (HOYA coordinate equivalent, 804465; supplier unconfirmed)
E9	Biconvex Positive	S-LAH96 (OHARA coordinate equivalent, 764485; supplier unconfirmed)
E10	Biconvex Positive (2× Asph)	M-TAF101 (HOYA coordinate equivalent, 768492; supplier unconfirmed)
E11	Biconvex Positive	E-FDS1-W (HOYA coordinate equivalent, 923209; supplier unconfirmed)
E12	Biconcave Negative	S-NBH53V (OHARA coordinate equivalent, 738323; supplier unconfirmed)
E13	Positive Meniscus	FCD10A (HOYA coordinate equivalent, 459902; supplier unconfirmed)
E14	Biconcave Negative	S-NBH53V (OHARA coordinate equivalent, 738323; supplier unconfirmed)
E15	Biconvex Positive	FCD1 (HOYA coordinate equivalent, 497816; supplier unconfirmed)
E16	Biconvex Positive	FCD515 (HOYA coordinate equivalent, 593686; supplier unconfirmed)
E17	Pos. Meniscus (2× Asph)	M-TAF101 (HOYA coordinate equivalent, 768492; supplier unconfirmed)