SCHNEIDER-KREUZNACH APO-SYMMAR 100mm f/5.6 — Optical Cross-Section & Ray Tracing

Home / Lenses / Schneider-Kreuznach / SCHNEIDER-KREUZNACH APO-SYMMAR 100mm f/5.6SCHNEIDER-KREUZNACH APO-SYMMAR 100mm f/5.6US 6,028,720 Example 2 / Claim 5 — Wartmann & Schauss
6 ELEMENTS / 4 GROUPS
f ≈ 103.0 mm (d-line)
F/5.6
2ω ≈ 72° (production, at f/22)
ALL SPHERICAL
Focus MechanismUnit focus — entire lens moves via view camera bellows/rail. No internal focusing groups.
Optical Elements (6)ElementTypeGlass
L1Biconvex PositiveS-PHM53 (OHARA)
L2Biconcave NegativeN-BALF5 (Schott)
L3Positive MeniscusUnmatched (phosphate crown class, ne=1.5223, ve=69.5; no public catalog match — possible special melt or discontinued glass)
L4Positive Meniscus529770 — N-PK51 (Schott phosphate crown; no local Sellmeier)
L5Negative MeniscusN-BALF5 (Schott)
L6Positive MeniscusS-PHM53 (OHARA)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Biconvex Positive	S-PHM53 (OHARA)
L2	Biconcave Negative	N-BALF5 (Schott)
L3	Positive Meniscus	Unmatched (phosphate crown class, ne=1.5223, ve=69.5; no public catalog match — possible special melt or discontinued glass)
L4	Positive Meniscus	529770 — N-PK51 (Schott phosphate crown; no local Sellmeier)
L5	Negative Meniscus	N-BALF5 (Schott)
L6	Positive Meniscus	S-PHM53 (OHARA)