PANASONIC LEICA DG SUMMILUX 15mm f/1.7 ASPH — Optical Cross-Section & Ray Tracing

Home / Lenses / Panasonic / PANASONIC LEICA DG SUMMILUX 15mm f/1.7 ASPHPANASONIC LEICA DG SUMMILUX 15mm f/1.7 ASPHUS 2015/0268449 A1 Example 2 — Panasonic / Kurioka, Nishioka
9 ELEMENTS / 7 GROUPS
f ≈ 15.5 mm
F/1.77
2ω ≈ 70.5°
5 ASPHERICAL SURFACES
Focus MechanismInner focus — G2 (L6–L8) translates toward object. Stepping motor drive.
Optical Elements (9)ElementTypeGlass
L1Biconcave NegativeFPL51 class (499/801, OHARA family)
L2Biconcave Negative (2× Asph)585417 — light flint (patent nd=1.58542, nu_d=41.7)
L3Biconvex Positive882408 — high-index lanthanum glass (patent nd=1.88234, nu_d=40.8)
L4Negative Meniscus754260 — dense flint (patent nd=1.75409, nu_d=26.0)
L5Biconvex Positive916364 — high-index lanthanum glass (patent nd=1.91597, nu_d=36.4)
L6Biconcave Negative786275 — dense flint (patent nd=1.78630, nu_d=27.5)
L7Biconvex Positive (1× Asph)769497 — lanthanum crown (patent nd=1.76864, nu_d=49.7)
L8Biconvex PositiveL-LAH83 (OHARA)
L9Neg. Meniscus (2× Asph)E-FD15 class (697/290, HOYA family)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Biconcave Negative	FPL51 class (499/801, OHARA family)
L2	Biconcave Negative (2× Asph)	585417 — light flint (patent nd=1.58542, nu_d=41.7)
L3	Biconvex Positive	882408 — high-index lanthanum glass (patent nd=1.88234, nu_d=40.8)
L4	Negative Meniscus	754260 — dense flint (patent nd=1.75409, nu_d=26.0)
L5	Biconvex Positive	916364 — high-index lanthanum glass (patent nd=1.91597, nu_d=36.4)
L6	Biconcave Negative	786275 — dense flint (patent nd=1.78630, nu_d=27.5)
L7	Biconvex Positive (1× Asph)	769497 — lanthanum crown (patent nd=1.76864, nu_d=49.7)
L8	Biconvex Positive	L-LAH83 (OHARA)
L9	Neg. Meniscus (2× Asph)	E-FD15 class (697/290, HOYA family)