PENTAX-02 STANDARD ZOOM 5-15mm f/2.8-4.5 — Optical Cross-Section & Ray Tracing

Home / Lenses / Pentax / PENTAX-02 STANDARD ZOOM 5-15mm f/2.8-4.5PENTAX-02 STANDARD ZOOM 5-15mm f/2.8-4.5US 8,824,059 B2↗ — Koji Kato, Masakazu Saori
8 ELEMENTS / 7 PHYSICAL GROUPS
MARKETED 5-15mm f/2.8-4.5
DESIGN f = 5.139-14.825 mm; FNO = 2.8 / 3.7 / 4.6
5 ASPHERICAL SURFACES
Focus MechanismCONSTRAINED_RECONSTRUCTION: L21/G2 alone moves imageward from infinity to the manufacturer 0.3 m MFD. D7 increases and D9 decreases by equal amounts at each zoom position, preserving their adjacent-gap sum. The close pairs were re-solved on the OP/CG-normalized active prescription; the patent publishes the focus group and direction but no finite-focus spacing table.
Optical Elements (8 physical; 9 modeled media)ElementTypeGlass
L11GNegative Meniscus773496 class
L11RHybrid Resin Layer (1x Asph)Unmatched (compound resin, nd=1.52972, vd=42.7)
L12Negative Meniscus804465 class
L13Negative MeniscusUnmatched (nd=1.74930, vd=51.1)
L21Positive Meniscus847238 class
L31Biconvex Positive (2x Asph)Unmatched (nd=1.49283, vd=82.7)
L32Biconvex Positive497816 class
L33Biconcave Negative834373 class
L34Biconvex Positive (2x Asph)Unmatched (nd=1.51885, vd=65.8)

Element	Type	Glass
L11G	Negative Meniscus	773496 class
L11R	Hybrid Resin Layer (1x Asph)	Unmatched (compound resin, nd=1.52972, vd=42.7)
L12	Negative Meniscus	804465 class
L13	Negative Meniscus	Unmatched (nd=1.74930, vd=51.1)
L21	Positive Meniscus	847238 class
L31	Biconvex Positive (2x Asph)	Unmatched (nd=1.49283, vd=82.7)
L32	Biconvex Positive	497816 class
L33	Biconcave Negative	834373 class
L34	Biconvex Positive (2x Asph)	Unmatched (nd=1.51885, vd=65.8)