VOIGTLÄNDER ULTRON Vintage Line 28mm f/2 Aspherical — Optical Cross-Section & Ray Tracing

Home / Lenses / Voigtländer / VOIGTLÄNDER ULTRON Vintage Line 28mm f/2 AsphericalVOIGTLÄNDER ULTRON Vintage Line 28mm f/2 AsphericalJP2022-100641A EXAMPLE 1 — COSINA / HATTA Shōju, SHIBATA Yūki
10 ELEMENTS / 7 GROUPS
f = 28.50 mm
F/2.0
2ω = 75.4°
2 ASPHERICAL SURFACES (1 ELEMENT)
2 APD ELEMENTS
Focus MechanismUnit focus: entire lens assembly translates forward 1.93 mm via helicoid. No internal group movement. BFD increases from 18.40 mm (∞) to 20.33 mm (m = 0.0676). Subject-to-sensor distance at closest focus ≈ 492 mm.
Optical Elements (10)ElementTypeGlass
L1Negative MeniscusBSC7 (HOYA) / N-BK7 (Schott)
L2Plano-ConcaveE-FD2 (HOYA, patent nd/vd match) / SF2 (Schott)
L3Plano-ConvexTAFD35 (HOYA, patent nd/vd match)
L4Biconvex PositiveTAFD35 (HOYA, patent nd/vd match)
L5Biconcave NegativeS-TIH14 (OHARA, patent nd/vd match)
L6Biconcave NegativeS-TIH1 (OHARA) / SF1 (Schott)
L7Biconvex PositiveS-LAC14 (OHARA) / N-LaK14 (Schott)
L8Biconvex PositiveH-ZLAF68C (CDGM, patent nd/vd match)
L9Negative MeniscusUnmatched (630581 crown/APD candidate; patent nd=1.62999, νd=58.12)
L10Neg. Meniscus (2× Asph)NBFD3 (HOYA) / S-LAH63Q (OHARA)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Negative Meniscus	BSC7 (HOYA) / N-BK7 (Schott)
L2	Plano-Concave	E-FD2 (HOYA, patent nd/vd match) / SF2 (Schott)
L3	Plano-Convex	TAFD35 (HOYA, patent nd/vd match)
L4	Biconvex Positive	TAFD35 (HOYA, patent nd/vd match)
L5	Biconcave Negative	S-TIH14 (OHARA, patent nd/vd match)
L6	Biconcave Negative	S-TIH1 (OHARA) / SF1 (Schott)
L7	Biconvex Positive	S-LAC14 (OHARA) / N-LaK14 (Schott)
L8	Biconvex Positive	H-ZLAF68C (CDGM, patent nd/vd match)
L9	Negative Meniscus	Unmatched (630581 crown/APD candidate; patent nd=1.62999, νd=58.12)
L10	Neg. Meniscus (2× Asph)	NBFD3 (HOYA) / S-LAH63Q (OHARA)