MINOLTA MD ZOOM 24-50mm f/4 — Optical Cross-Section & Ray Tracing

Home / Lenses / Minolta / MINOLTA MD ZOOM 24-50mm f/4MINOLTA MD ZOOM 24-50mm f/4US 4,147,410↗ — Masaichi Shimomura, Mitsuaki Horimoto
13 ELEMENTS / 11 GROUPS
DESIGN f = 24.51-48.59 mm
F/4 CONSTANT (INFERRED IRIS SCHEDULE)
2ω = 84°-47°
ALL-SPHERICAL
Focus MechanismReconstructed front-group focus: the patent publishes infinity states only. Group I translates toward the object (D11 grows) while group II and the film plane stay fixed; the 2.34-2.37 mm extension is solved at each zoom station for an object 0.7 m from the film plane (Minolta 2.3 ft minimum focus). Minolta does not state which group focuses.
Optical Elements (13 physical)ElementTypeGlass
L1Positive MeniscusUnmatched (600644 phosphate-crown class; nearest current catalog coordinates sit at Δnd +0.003, outside the runtime window)
L2Negative Meniscus743492 — lanthanum flint (NBF1 / S-LAM60 class; supplier unconfirmed)
L3Negative Meniscus743492 — lanthanum flint (NBF1 / S-LAM60 class; supplier unconfirmed)
L4Biconvex PositiveUnmatched (711433 lanthanum-flint class; nearest catalog coordinate is HOYA LAFL4 at Δnd +0.0021, outside the relabel window)
L5Biconcave Negative639557 — dense barium crown (S-BSM18 / BACD18 class; supplier unconfirmed)
L6Positive Meniscus717294 — dense flint (S-TIH1 / SF1 class; supplier unconfirmed)
L7Biconvex Positive517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L8Positive Meniscus517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L9Positive Meniscus517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L10Positive Meniscus805254 — dense flint (SF6 / S-TIH6 class; supplier unconfirmed)
L11Biconcave NegativeUnmatched (757297 lanthanum dense-flint class; no current catalog glass within Δnd 0.003 / Δνd 2)
L12Positive Meniscus517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L13Biconvex PositiveUnmatched (600644 phosphate-crown class; nearest current catalog coordinates sit at Δnd +0.003, outside the runtime window)

Element	Type	Glass
L1	Positive Meniscus	Unmatched (600644 phosphate-crown class; nearest current catalog coordinates sit at Δnd +0.003, outside the runtime window)
L2	Negative Meniscus	743492 — lanthanum flint (NBF1 / S-LAM60 class; supplier unconfirmed)
L3	Negative Meniscus	743492 — lanthanum flint (NBF1 / S-LAM60 class; supplier unconfirmed)
L4	Biconvex Positive	Unmatched (711433 lanthanum-flint class; nearest catalog coordinate is HOYA LAFL4 at Δnd +0.0021, outside the relabel window)
L5	Biconcave Negative	639557 — dense barium crown (S-BSM18 / BACD18 class; supplier unconfirmed)
L6	Positive Meniscus	717294 — dense flint (S-TIH1 / SF1 class; supplier unconfirmed)
L7	Biconvex Positive	517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L8	Positive Meniscus	517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L9	Positive Meniscus	517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L10	Positive Meniscus	805254 — dense flint (SF6 / S-TIH6 class; supplier unconfirmed)
L11	Biconcave Negative	Unmatched (757297 lanthanum dense-flint class; no current catalog glass within Δnd 0.003 / Δνd 2)
L12	Positive Meniscus	517640 — borosilicate crown (N-BK7 / BSC7 class; supplier unconfirmed)
L13	Biconvex Positive	Unmatched (600644 phosphate-crown class; nearest current catalog coordinates sit at Δnd +0.003, outside the runtime window)