SAMYANG AF 14mm f/2.8 FE — Optical Cross-Section & Ray Tracing

Home / Lenses / Samyang / SAMYANG AF 14mm f/2.8 FESAMYANG AF 14mm f/2.8 FEKR 10-1933088 B1↗, Numerical Example 1 — Jae Myung Yu, Hae Jin Lee, Jung Du Lee
14 ELEMENTS / 10 GROUPS
MARKETED 14mm f/2.8
PARAXIAL EFL 14.5408 mm
MODELED F/2.86767; PATENT HFOV 57.031 deg
6 ASPHERICAL SURFACES / 3 ASPH ELEMENTS
INNER FOCUS
Focus MechanismPUBLISHED inner focus: G21 translates imageward while G11 and G31 remain fixed; infinity, MAG=-1/30, and TL=0.2 m D1/D2 states are retained. The 2.500 mm rear plate is traced (not drawn) at fixed D3 = 22.66 mm with the fixed D4 + D5 = 0.500 mm trailing gap; D5 is not modeled as a signed gap.
Optical Elements (14 physical)ElementTypeGlass
L11Positive Meniscus697555 - LAK14-class lanthanum crown
L21Negative Meniscus806333 - NBFD15/J-LASFH6-class dense flint
L31Negative Meniscus (2x Asph)P-LASF47 catalog-equivalent (patent coordinates retained; production supplier unspecified)
L41Negative Meniscus497816 - low-dispersion ED crown class
L51Biconvex Positive847238 - dense flint class
L61Biconcave Negative923209 - very-high-index dense flint class
L71Negative Meniscus (2x Asph)Unmatched (nd=1.877950, vd=37.3)
L81Negative Meniscus717295 - SF1/FD1-class dense flint
L91Biconvex Positive603380 - F5/F1-class flint
L101Negative Meniscus847238 - dense flint class
L111Biconcave Negative564608 - SK11/BACD11-class crown
L121Biconvex Positive (2x Asph)S-BAL35 catalog-equivalent (patent coordinates retained; production supplier unspecified)
L131Biconcave NegativeH-LaF7 catalog-equivalent (patent coordinates retained; production supplier unspecified)
L141Biconvex Positive497816 - low-dispersion ED crown class

Element	Type	Glass
L11	Positive Meniscus	697555 - LAK14-class lanthanum crown
L21	Negative Meniscus	806333 - NBFD15/J-LASFH6-class dense flint
L31	Negative Meniscus (2x Asph)	P-LASF47 catalog-equivalent (patent coordinates retained; production supplier unspecified)
L41	Negative Meniscus	497816 - low-dispersion ED crown class
L51	Biconvex Positive	847238 - dense flint class
L61	Biconcave Negative	923209 - very-high-index dense flint class
L71	Negative Meniscus (2x Asph)	Unmatched (nd=1.877950, vd=37.3)
L81	Negative Meniscus	717295 - SF1/FD1-class dense flint
L91	Biconvex Positive	603380 - F5/F1-class flint
L101	Negative Meniscus	847238 - dense flint class
L111	Biconcave Negative	564608 - SK11/BACD11-class crown
L121	Biconvex Positive (2x Asph)	S-BAL35 catalog-equivalent (patent coordinates retained; production supplier unspecified)
L131	Biconcave Negative	H-LaF7 catalog-equivalent (patent coordinates retained; production supplier unspecified)
L141	Biconvex Positive	497816 - low-dispersion ED crown class