SIGMA 16.6mm f/4 (Sigma DP1x) — Optical Cross-Section & Ray Tracing

Home / Lenses / Sigma / SIGMA 16.6mm f/4 (Sigma DP1x)SIGMA 16.6mm f/4 (Sigma DP1x)JP 2008-040033 A Example 1 - Sigma / Yoshino
6 elements / 5 groups
f = 16.6 mm (design 16.67 mm)
F4 (design F4.02)
2ω = 73.7°
1 aspherical surface
Rear-group internal focus
Focus MechanismRear-group internal focusing: G5 moves 3.5896 mm toward the object from infinity to 0.30 m while the first-surface-to-image track remains 56.2503 mm.
Optical Elements (6)ElementTypeGlass
G1Negative MeniscusHoya E-FL5 / Hikari J-LF5 light flint (nd=1.58144, νd≈40.9)
G2Negative MeniscusHoya FC5 / Ohara S-FSL5 / Hikari J-FK5 fluor crown (nd=1.48749, νd≈70.4)
G3Biconvex PositiveHoya TAC2 / Ohara S-LAL61Q class lanthanum crown
G4-L1Biconcave NegativeHoya FD140 / Ohara S-TIH14 / Hikari J-SF14 dense flint
G4-L2Biconvex Positive (1x Asph)Hoya M-TAF401 class lanthanum flint (soft match; Example 2 exact)
G5Biconvex PositiveM-BACD5N (Hoya) / S-BAL35 / N-SK5 crown
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
G1	Negative Meniscus	Hoya E-FL5 / Hikari J-LF5 light flint (nd=1.58144, νd≈40.9)
G2	Negative Meniscus	Hoya FC5 / Ohara S-FSL5 / Hikari J-FK5 fluor crown (nd=1.48749, νd≈70.4)
G3	Biconvex Positive	Hoya TAC2 / Ohara S-LAL61Q class lanthanum crown
G4-L1	Biconcave Negative	Hoya FD140 / Ohara S-TIH14 / Hikari J-SF14 dense flint
G4-L2	Biconvex Positive (1x Asph)	Hoya M-TAF401 class lanthanum flint (soft match; Example 2 exact)
G5	Biconvex Positive	M-BACD5N (Hoya) / S-BAL35 / N-SK5 crown