MINOLTA AF 135mm f/2.8 [T4.5] STF — Optical Cross-Section & Ray Tracing

Home / Lenses / Minolta / MINOLTA AF 135mm f/2.8 [T4.5] STFMINOLTA AF 135mm f/2.8 [T4.5] STFJP1999-231209 A — Yoshinobu Kudo
8 ELEMENTS / 6 GROUPS
135mm f/2.8 [T4.5] STF
MODELED EFL 135.001536 mm
2ω ≈ 18.18° AT Y′ = 21.6 mm
0.87 m MFD / 0.25×
POWERED 2-ELEMENT APODIZATION FILTER
Focus MechanismCONSTRAINED_RECONSTRUCTION: patent d7 changes 14.397→18.198 mm; BF is solved from β=-0.25 as 46.800156→80.007294 mm. The implied front/rear movement ratio is 1.114463:1 versus the patent's rounded 1.11:1.
Optical Elements (8 physical)ElementTypeGlass
L1Plano-Convex Positive603607 — crown class (vendor unresolved)
L2Negative Meniscus723380 — dense barium-flint class (vendor unresolved)
L3Positive Meniscus517642 — crown class (vendor unresolved)
L4Negative Meniscus613370 — flint class (vendor unresolved)
L5Plano-Concave Absorbing ND507589 — bulk absorbing ND glass (catalog unresolved; patent α=0.55)
L6Plano-Convex Positive501565 — crown class (K10-family equivalent; vendor unresolved)
L7Biconvex PositiveS-BAL35 (OHARA catalog equivalent; patent 589611; production supplier unspecified)
L8Negative Meniscus620603 — dense-crown class (vendor unresolved)

Element	Type	Glass
L1	Plano-Convex Positive	603607 — crown class (vendor unresolved)
L2	Negative Meniscus	723380 — dense barium-flint class (vendor unresolved)
L3	Positive Meniscus	517642 — crown class (vendor unresolved)
L4	Negative Meniscus	613370 — flint class (vendor unresolved)
L5	Plano-Concave Absorbing ND	507589 — bulk absorbing ND glass (catalog unresolved; patent α=0.55)
L6	Plano-Convex Positive	501565 — crown class (K10-family equivalent; vendor unresolved)
L7	Biconvex Positive	S-BAL35 (OHARA catalog equivalent; patent 589611; production supplier unspecified)
L8	Negative Meniscus	620603 — dense-crown class (vendor unresolved)