LEITZ TELYT 200mm f/4 (Visoflex) — Optical Cross-Section & Ray Tracing

Home / Lenses / Leica / LEITZ TELYT 200mm f/4 (Visoflex)LEITZ TELYT 200mm f/4 (Visoflex)DE 1 096 057 B↗ — Walter Mandler, Horst Schmidt
4 ELEMENTS / 4 GROUPS
f ≈ 200.3 mm
F/4
2ω ≈ 12.3°
ALL SPHERICAL
Focus MechanismUnit focusing: the complete optical head moves on a helicoid and only the back focal distance changes. The patent publishes the infinity state only; the 3.0 m (subject-to-film) state is reconstructed paraxially at the e-line, requiring 15.70 mm of extension at m ≈ −0.078.
Optical Elements (4 physical)ElementTypeGlass
L1Biconvex PositivePCD2 spectral proxy (HOYA; native e-line PSK2-type coordinates; historical supplier unconfirmed)
L2Biconcave NegativeSF10 spectral proxy (Schott; native e-line coordinates; historical supplier unconfirmed)
L3Positive MeniscusUnmatched (LaF8-class lanthanum flint; historical OHARA LAF8 / Schott LaFN8 coordinates, no current catalog match)
L4Negative MeniscusK10 spectral proxy (Schott; native e-line coordinates; historical supplier unconfirmed)

Element	Type	Glass
L1	Biconvex Positive	PCD2 spectral proxy (HOYA; native e-line PSK2-type coordinates; historical supplier unconfirmed)
L2	Biconcave Negative	SF10 spectral proxy (Schott; native e-line coordinates; historical supplier unconfirmed)
L3	Positive Meniscus	Unmatched (LaF8-class lanthanum flint; historical OHARA LAF8 / Schott LaFN8 coordinates, no current catalog match)
L4	Negative Meniscus	K10 spectral proxy (Schott; native e-line coordinates; historical supplier unconfirmed)