OLYMPUS M.ZUIKO DIGITAL 25mm f/1.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Olympus / OLYMPUS M.ZUIKO DIGITAL 25mm f/1.8OLYMPUS M.ZUIKO DIGITAL 25mm f/1.8JP 2015-075501 A↗ — Yukihiro Yamamoto
9 ELEMENTS / 7 GROUPS
DESIGN f = 24.53 mm
DESIGN F/1.82
2ω = 48.10°
3 ASPHERICAL SURFACES / 2 ELEMENTS
Focus MechanismPUBLISHED inner focus: G2 (L5-L7, surfaces 9-13) moves 2.9383 mm toward the object from infinity to the patent's 250 mm shooting distance. G1 (G1a-G1c), the stop, G3 (G3a, G3b) and the image plane stay fixed. Intermediate gaps are interpolated linearly between the two published states.
Optical Elements (9 physical)ElementTypeGlass
L1Negative MeniscusE-F1 (HOYA equivalent)
L2Biconvex PositiveTAFD33 (HOYA equivalent)
L3Biconvex Positive (1x Asph)NBFD13 (HOYA equivalent)
L4Biconcave NegativeE-F5 (HOYA equivalent)
L5Biconcave NegativeE-FD15 (HOYA equivalent)
L6Biconvex PositiveTAFD33 (HOYA equivalent)
L7Biconvex Positive (2x Asph)M-LAC130 (HOYA equivalent)
L8Negative MeniscusE-FD13 (HOYA equivalent)
L9Positive MeniscusTAFD5F (HOYA equivalent)

Element	Type	Glass
L1	Negative Meniscus	E-F1 (HOYA equivalent)
L2	Biconvex Positive	TAFD33 (HOYA equivalent)
L3	Biconvex Positive (1x Asph)	NBFD13 (HOYA equivalent)
L4	Biconcave Negative	E-F5 (HOYA equivalent)
L5	Biconcave Negative	E-FD15 (HOYA equivalent)
L6	Biconvex Positive	TAFD33 (HOYA equivalent)
L7	Biconvex Positive (2x Asph)	M-LAC130 (HOYA equivalent)
L8	Negative Meniscus	E-FD13 (HOYA equivalent)
L9	Positive Meniscus	TAFD5F (HOYA equivalent)