SIGMA 60mm f/2.8 DN | Art — Optical Cross-Section & Ray Tracing

Home / Lenses / Sigma / SIGMA 60mm f/2.8 DN | ArtSIGMA 60mm f/2.8 DN | ArtJP 2014-145954 A — Example 1
8 elements / 6 groups
f = 60.00 mm patent design
F2.8 marketed; F2.92 design
2ω = 26.38° patent field
1 aspherical surface
Inner focus
Focus MechanismInner focus: the two-element positive second group moves toward the object from infinity to near focus while G1, the stop, and G3 remain fixed.
Optical Elements (8)ElementTypeGlass
L1aPositive MeniscusTAF3 / N-LASF44 class (804/465 dense lanthanum flint)
L1bPlano-Convex PositiveFCD515 (HOYA, SLD fluorophosphate class)
L1cPlano-Concave NegativeE-F5 (HOYA) / S-TIM5 class
L2aNegative MeniscusE-FD2 (HOYA) / N-SF2 class
L2bBiconvex Positive (1× Asph)M-PCD51 (HOYA, moldable low-dispersion crown)
L3aBiconcave NegativeE-FL5 (HOYA) / S-TIL25 class
L3bNegative MeniscusE-FD15 (HOYA) / N-SF15 class
L3cPositive MeniscusTAFD55 (HOYA) / S-LAH99 class
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1a	Positive Meniscus	TAF3 / N-LASF44 class (804/465 dense lanthanum flint)
L1b	Plano-Convex Positive	FCD515 (HOYA, SLD fluorophosphate class)
L1c	Plano-Concave Negative	E-F5 (HOYA) / S-TIM5 class
L2a	Negative Meniscus	E-FD2 (HOYA) / N-SF2 class
L2b	Biconvex Positive (1× Asph)	M-PCD51 (HOYA, moldable low-dispersion crown)
L3a	Biconcave Negative	E-FL5 (HOYA) / S-TIL25 class
L3b	Negative Meniscus	E-FD15 (HOYA) / N-SF15 class
L3c	Positive Meniscus	TAFD55 (HOYA) / S-LAH99 class