YASHICA YASHINON-DX 21mm f/3.3 — Optical Cross-Section & Ray Tracing

Home / Lenses / Yashica / YASHICA YASHINON-DX 21mm f/3.3YASHICA YASHINON-DX 21mm f/3.3JP1969-024068 — Iwatatsu Fujioka
8 ELEMENTS / 5 GROUPS
21mm
f/3.3
92°
MFD 0.8m
Focus MechanismNO_INTERNAL_RECONSTRUCTION — JP1969-024068 Example 1 publishes one fixed prescription and no finite-focus movement table; the 0.8m marketed MFD is metadata only and no focus movement is modeled.
Optical Elements (8 physical)ElementTypeGlass
L1Negative Meniscus670573 d-line class (historical vendor unresolved)
L2Biconvex Positive717479 d-line class (historical vendor unresolved)
L3Biconcave Negative643478 d-line class (historical vendor unresolved)
L4Biconvex Positive641568 d-line class; LACL1 catalog equivalent (production supplier unspecified)
L5Biconcave Negative589486 d-line class; BAF6 catalog equivalent (production supplier unspecified)
L6Biconvex Positive622531 d-line class (historical vendor unresolved)
L7Negative Meniscus717295 d-line class (historical vendor unresolved)
L8Negative Meniscus571510 d-line class; BAFL2 catalog equivalent (production supplier unspecified)

Element	Type	Glass
L1	Negative Meniscus	670573 d-line class (historical vendor unresolved)
L2	Biconvex Positive	717479 d-line class (historical vendor unresolved)
L3	Biconcave Negative	643478 d-line class (historical vendor unresolved)
L4	Biconvex Positive	641568 d-line class; LACL1 catalog equivalent (production supplier unspecified)
L5	Biconcave Negative	589486 d-line class; BAF6 catalog equivalent (production supplier unspecified)
L6	Biconvex Positive	622531 d-line class (historical vendor unresolved)
L7	Negative Meniscus	717295 d-line class (historical vendor unresolved)
L8	Negative Meniscus	571510 d-line class; BAFL2 catalog equivalent (production supplier unspecified)