SONY FE 28-70mm f/2 GM — Optical Cross-Section & Ray Tracing

Home / Lenses / Sony / SONY FE 28-70mm f/2 GMSONY FE 28-70mm f/2 GMWO 2025/263124 A1↗ — Takashi Yamasaki, Iwao Yamada
20 ELEMENTS / 14 GROUPS
f = 28.86–67.87 mm
F/2.06
2ω = 73.71–35.36°
10 ASPHERICAL SURFACES (5 elements)
Focus MechanismDual-group floating inner focus: G5 (L51, negative) moves toward image, G6 (L61, positive) moves toward object. Four XD linear motors (two per group).
Optical Elements (20 physical)ElementTypeGlass
L11Negative MeniscusDense flint (≈S-NPH1W, OHARA; Δnd = +0.0008, probable proprietary melt)
L12Biconvex Positive595686 — fluorophosphate crown (patent nd=1.59489, νd=68.6)
L13Positive Meniscus596670 - fluorophosphate crown (patent nd=1.59561, vd=67.0; no exact public catalog match)
L21Neg. Meniscus (2× Asph)774494 — lanthanum crown (patent nd=1.77373, νd=49.4)
L22Biconcave Negative777297 — dense flint (patent nd=1.77660, νd=29.7)
L23Biconvex Positive930240 — ultra-high-index dense flint (patent nd=1.93024, νd=24.0)
L24Negative Meniscus700555 — barium crown (patent nd=1.69980, νd=55.5)
L31Biconvex Positive (2× Asph)856401 — lanthanum dense crown (patent nd=1.85612, νd=40.1)
L32Biconvex PositiveS-FPL55 (OHARA)
L33Biconcave Negative571560 — barium crown (patent nd=1.57125, νd=56.0)
L41Negative MeniscusUnmatched (patent nd=2.00912, νd=29.10; prior S-NPH85 annotation not coefficient-backed)
L42Positive MeniscusS-FPL55 (OHARA)
L43Biconvex PositiveS-FPL55 (OHARA)
L44Biconcave Negative863252 — dense flint (patent nd=1.86252, νd=25.2)
L45Biconvex Positive (2× Asph)856401 — lanthanum dense crown (patent nd=1.85612, νd=40.1)
L51Neg. Meniscus (2× Asph)L-LAH85V (OHARA catalog equivalent; production supplier unspecified)
L61Biconvex Positive (2× Asph)J-PSKH4 (HIKARI catalog equivalent; production supplier unspecified)
L71Positive MeniscusUnmatched ultra-high-index dense flint (patent nd=2.00009, νd=16.5; prior S-NPH7 attribution unsupported)
L72Negative Meniscus863252 — dense flint (patent nd=1.86252, νd=25.2)
L73Negative MeniscusL-LAH85V (OHARA catalog equivalent; production supplier unspecified)

Element	Type	Glass
L11	Negative Meniscus	Dense flint (≈S-NPH1W, OHARA; Δnd = +0.0008, probable proprietary melt)
L12	Biconvex Positive	595686 — fluorophosphate crown (patent nd=1.59489, νd=68.6)
L13	Positive Meniscus	596670 - fluorophosphate crown (patent nd=1.59561, vd=67.0; no exact public catalog match)
L21	Neg. Meniscus (2× Asph)	774494 — lanthanum crown (patent nd=1.77373, νd=49.4)
L22	Biconcave Negative	777297 — dense flint (patent nd=1.77660, νd=29.7)
L23	Biconvex Positive	930240 — ultra-high-index dense flint (patent nd=1.93024, νd=24.0)
L24	Negative Meniscus	700555 — barium crown (patent nd=1.69980, νd=55.5)
L31	Biconvex Positive (2× Asph)	856401 — lanthanum dense crown (patent nd=1.85612, νd=40.1)
L32	Biconvex Positive	S-FPL55 (OHARA)
L33	Biconcave Negative	571560 — barium crown (patent nd=1.57125, νd=56.0)
L41	Negative Meniscus	Unmatched (patent nd=2.00912, νd=29.10; prior S-NPH85 annotation not coefficient-backed)
L42	Positive Meniscus	S-FPL55 (OHARA)
L43	Biconvex Positive	S-FPL55 (OHARA)
L44	Biconcave Negative	863252 — dense flint (patent nd=1.86252, νd=25.2)
L45	Biconvex Positive (2× Asph)	856401 — lanthanum dense crown (patent nd=1.85612, νd=40.1)
L51	Neg. Meniscus (2× Asph)	L-LAH85V (OHARA catalog equivalent; production supplier unspecified)
L61	Biconvex Positive (2× Asph)	J-PSKH4 (HIKARI catalog equivalent; production supplier unspecified)
L71	Positive Meniscus	Unmatched ultra-high-index dense flint (patent nd=2.00009, νd=16.5; prior S-NPH7 attribution unsupported)
L72	Negative Meniscus	863252 — dense flint (patent nd=1.86252, νd=25.2)
L73	Negative Meniscus	L-LAH85V (OHARA catalog equivalent; production supplier unspecified)