PENTAX SMC DA 16-45mm f/4 ED AL — Optical Cross-Section & Ray Tracing

Home / Lenses / Pentax / PENTAX SMC DA 16-45mm f/4 ED ALPENTAX SMC DA 16-45mm f/4 ED ALUS 7,106,520 B2↗ — Masakazu Saori
13 ELEMENTS / 10 GROUPS
16-45 mm f/4 MARKETING
16.30-43.70 mm / F4.1 MODEL
APS-C / PENTAX K
2 ASPHERICAL SURFACES
Focus MechanismCONSTRAINED_RECONSTRUCTION: the patent assigns focusing to G1 only but publishes no finite-focus spacing table. At the production 0.28 m MFD, G1 translation was solved independently with the image plane and G2-G4 fixed; the tele-state paraxial magnification is -0.25749 (|m|≈0.26). Close-focus d8 values are reconstructed, not patent-published.
Optical Elements (13 physical; 14 modeled media)ElementTypeGlass
L11Negative Meniscus697555 class
L12Negative Meniscus713539 class
L13Negative Meniscus (1× Asph)Unmatched (nd=1.52538, vd=56.3)
L14Biconvex Positive847238 class
L21Biconvex Positive487702 class
L22Biconvex Positive497816 ED class
L23Biconvex Positive487702 class
L24Negative Meniscus673321 class
L31Positive Meniscus805254 class
L32Biconcave Negative762401 class
L41rThin Resin Aspherical LayerResin layer (patent hybrid asphere)
L41gBiconvex Positive589612 class
L42Negative Meniscus806333 class
L43Biconvex Positive487702 class

Element	Type	Glass
L11	Negative Meniscus	697555 class
L12	Negative Meniscus	713539 class
L13	Negative Meniscus (1× Asph)	Unmatched (nd=1.52538, vd=56.3)
L14	Biconvex Positive	847238 class
L21	Biconvex Positive	487702 class
L22	Biconvex Positive	497816 ED class
L23	Biconvex Positive	487702 class
L24	Negative Meniscus	673321 class
L31	Positive Meniscus	805254 class
L32	Biconcave Negative	762401 class
L41r	Thin Resin Aspherical Layer	Resin layer (patent hybrid asphere)
L41g	Biconvex Positive	589612 class
L42	Negative Meniscus	806333 class
L43	Biconvex Positive	487702 class