PENTAX SMC DA 17-70mm f/4 AL [IF] SDM — Optical Cross-Section & Ray Tracing

Home / Lenses / Pentax / PENTAX SMC DA 17-70mm f/4 AL [IF] SDMPENTAX SMC DA 17-70mm f/4 AL [IF] SDMUS 7,804,652 B2↗ — Masakazu Saori
17 ELEMENTS / 12 GROUPS
DESIGN 17.50–67.89 mm
F/4.1 MODELED
2ω = 80.6°–23.2°
2 HYBRID ASPHERICAL ELEMENTS
Focus MechanismNO_INTERNAL_RECONSTRUCTION: the production lens uses inner focusing, but Embodiment 4 publishes only infinity zoom states. Focus endpoint spacings are intentionally identical at every zoom position.
Optical Elements (17 physical; 19 modeled media)ElementTypeGlass
L1Negative Meniscus, convex to object847238 — dense flint (vendor unresolved)
L2Positive Meniscus, convex to object713539 — LAC8/S-LAL8-class lanthanum crown (code equivalent)
L3Positive Meniscus, convex to object773496 — high-index lanthanum flint (vendor unresolved)
L4rHybrid Resin Negative Meniscus (1× Asph)Unmatched (hybrid aspherical resin nd=1.52700, vd=43.7)
L4gNegative Meniscus804466 — high-index lanthanum flint (vendor unresolved)
L5Biconcave Negative804466 — high-index lanthanum flint (vendor unresolved)
L6Biconcave Negative834372 — dense lanthanum flint (vendor unresolved)
L7Biconvex Positive593353 — flint (vendor unresolved)
L8Biconcave Negative804466 — high-index lanthanum flint (vendor unresolved)
L9Biconvex Positive785257 — dense flint (vendor unresolved)
L10Biconvex Positive567428 — light flint (vendor unresolved)
L11Biconvex Positive589612 — barium crown (vendor unresolved)
L12Biconcave Negative805254 — dense flint (vendor unresolved)
L13Positive Meniscus, convex to image847238 — dense flint (vendor unresolved)
L14Biconcave Negative804466 — high-index lanthanum flint (vendor unresolved)
L15Biconvex Positive487702 — fluor crown (vendor unresolved)
L16rHybrid Resin Positive Meniscus (1× Asph)Unmatched (hybrid aspherical resin nd=1.52972, vd=42.7)
L16gBiconcave Negative805254 — dense flint (vendor unresolved)
L17Biconvex Positive487702 — fluor crown (vendor unresolved)

Element	Type	Glass
L1	Negative Meniscus, convex to object	847238 — dense flint (vendor unresolved)
L2	Positive Meniscus, convex to object	713539 — LAC8/S-LAL8-class lanthanum crown (code equivalent)
L3	Positive Meniscus, convex to object	773496 — high-index lanthanum flint (vendor unresolved)
L4r	Hybrid Resin Negative Meniscus (1× Asph)	Unmatched (hybrid aspherical resin nd=1.52700, vd=43.7)
L4g	Negative Meniscus	804466 — high-index lanthanum flint (vendor unresolved)
L5	Biconcave Negative	804466 — high-index lanthanum flint (vendor unresolved)
L6	Biconcave Negative	834372 — dense lanthanum flint (vendor unresolved)
L7	Biconvex Positive	593353 — flint (vendor unresolved)
L8	Biconcave Negative	804466 — high-index lanthanum flint (vendor unresolved)
L9	Biconvex Positive	785257 — dense flint (vendor unresolved)
L10	Biconvex Positive	567428 — light flint (vendor unresolved)
L11	Biconvex Positive	589612 — barium crown (vendor unresolved)
L12	Biconcave Negative	805254 — dense flint (vendor unresolved)
L13	Positive Meniscus, convex to image	847238 — dense flint (vendor unresolved)
L14	Biconcave Negative	804466 — high-index lanthanum flint (vendor unresolved)
L15	Biconvex Positive	487702 — fluor crown (vendor unresolved)
L16r	Hybrid Resin Positive Meniscus (1× Asph)	Unmatched (hybrid aspherical resin nd=1.52972, vd=42.7)
L16g	Biconcave Negative	805254 — dense flint (vendor unresolved)
L17	Biconvex Positive	487702 — fluor crown (vendor unresolved)