SMC PENTAX-A ZOOM 35-70mm f/4 — Optical Cross-Section & Ray Tracing

Home / Lenses / Pentax / SMC PENTAX-A ZOOM 35-70mm f/4SMC PENTAX-A ZOOM 35-70mm f/4US 4,812,022↗ — Shigetada Sato
7 ELEMENTS / 7 GROUPS
35-70mm f/4 (MARKETED)
36-68.5mm f/4.1 (PATENT)
2ω = 64.5°-34.7°
MFD 0.25 m
ALL-SPHERICAL
Focus MechanismNO_INTERNAL_RECONSTRUCTION: Example 3 publishes zoom-only infinity data. The production 0.25 m MFD is metadata only; no close-focus internal motion is modeled.
Optical Elements (7 physical)ElementTypeGlass
L1Negative Meniscus (convex to object)834372 class (vendor unresolved)
L2Negative Meniscus806409 class (vendor unresolved)
L3Positive Meniscus (convex to object)805254 class (vendor unresolved)
L4Biconvex PositiveS-LAM2 (OHARA catalog equivalent for patent 744447; production supplier unspecified)
L5Positive Meniscus658509 class (vendor unresolved)
L6Biconcave Negative805254 class (vendor unresolved)
L7Positive Meniscus581408 class (vendor unresolved)

Element	Type	Glass
L1	Negative Meniscus (convex to object)	834372 class (vendor unresolved)
L2	Negative Meniscus	806409 class (vendor unresolved)
L3	Positive Meniscus (convex to object)	805254 class (vendor unresolved)
L4	Biconvex Positive	S-LAM2 (OHARA catalog equivalent for patent 744447; production supplier unspecified)
L5	Positive Meniscus	658509 class (vendor unresolved)
L6	Biconcave Negative	805254 class (vendor unresolved)
L7	Positive Meniscus	581408 class (vendor unresolved)