OLYMPUS G.ZUIKO AUTO-W 25mm f/2.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Olympus / OLYMPUS G.ZUIKO AUTO-W 25mm f/2.8OLYMPUS G.ZUIKO AUTO-W 25mm f/2.8JP S39-18282 Y1↗, sole example — Saburo Yanagawa, Jihei Nakagawa
7 ELEMENTS / 5 GROUPS
DESIGN f = 25.00 mm
DESIGN F/2.80
ALL SPHERICAL
RETROFOCUS
Focus MechanismUnit focus moves the whole lens toward the object, with all internal spacings fixed. The close-focus spacing is calculated for an object 0.25 m from the image plane.
Optical Elements (7 physical)ElementTypeGlass
L1Biconvex PositiveBASF7 (SUMITA coordinate equivalent; supplier unconfirmed)
L2Biconcave NegativeK-BK7 (SUMITA coordinate equivalent; supplier unconfirmed)
L3Plano-ConvexLAF3 (HOYA coordinate equivalent; supplier unconfirmed)
L4Positive MeniscusK-SK18 (SUMITA coordinate equivalent; supplier unconfirmed)
L5Negative MeniscusE-FD8 (HOYA coordinate equivalent; supplier unconfirmed)
L6Negative MeniscusE-FD10 (HOYA coordinate equivalent; supplier unconfirmed)
L7Positive MeniscusN-SK10 (SCHOTT coordinate equivalent; supplier unconfirmed)

Element	Type	Glass
L1	Biconvex Positive	BASF7 (SUMITA coordinate equivalent; supplier unconfirmed)
L2	Biconcave Negative	K-BK7 (SUMITA coordinate equivalent; supplier unconfirmed)
L3	Plano-Convex	LAF3 (HOYA coordinate equivalent; supplier unconfirmed)
L4	Positive Meniscus	K-SK18 (SUMITA coordinate equivalent; supplier unconfirmed)
L5	Negative Meniscus	E-FD8 (HOYA coordinate equivalent; supplier unconfirmed)
L6	Negative Meniscus	E-FD10 (HOYA coordinate equivalent; supplier unconfirmed)
L7	Positive Meniscus	N-SK10 (SCHOTT coordinate equivalent; supplier unconfirmed)