HD PENTAX-D FA 150-450mm f/4.5-5.6 ED DC AW

US 2016/0327774 A1 — Minoru Murayama

Marketed 150–450mm f/4.5–5.6
Design f = 153.50–440.00 mm
Design F/4.6–5.7
18 elements / 14 groups
3 ED + 1 ANOMALOUS-DISPERSION ELEMENT
35 mm full-frame · Y = 21.64 mm

Focus Mechanism

CONSTRAINED_RECONSTRUCTION: the patent publishes infinity zoom states and specifies G5 rear focus. Close-focus values are code-solved at the official 2.0 m MFD with only G5 moving imageward; D26 + BF is conserved at each zoom position. These close-focus spacings are not patent-published.

Optical Elements (18 physical)

ElementTypeGlass
L11Negative Meniscus750353 (vendor unresolved; patent nd/νd coordinate)
L12Positive Meniscus497816 (vendor unresolved; patent nd/νd coordinate)
L13Biconvex Positive538747 (vendor unresolved; patent nd/νd coordinate)
L21Biconvex Positive717295 (vendor unresolved; patent nd/νd coordinate)
L22Biconcave Negative786442 (vendor unresolved; patent nd/νd coordinate)
L31Biconvex Positive516641 (vendor unresolved; patent nd/νd coordinate)
L32Biconcave Negative806409 (vendor unresolved; patent nd/νd coordinate)
L33Biconvex PositiveS-TIM27 (OHARA catalog equivalent for patent 640345; production supplier unspecified)
L34Biconcave Negative757478 (vendor unresolved; patent nd/νd coordinate)
L41Negative Meniscus717295 (vendor unresolved; patent nd/νd coordinate)
L42Biconvex Positive618634 (vendor unresolved; patent nd/νd coordinate)
L43Biconvex Positive589612 (vendor unresolved; patent nd/νd coordinate)
L44Negative Meniscus750353 (vendor unresolved; patent nd/νd coordinate)
L45Biconvex Positive658509 (vendor unresolved; patent nd/νd coordinate)
L51Negative Meniscus835427 (vendor unresolved; patent nd/νd coordinate)
L52Biconvex Positive717295 (vendor unresolved; patent nd/νd coordinate)
L53Negative Meniscus497816 (vendor unresolved; patent nd/νd coordinate)
L54Biconcave Negative804466 (vendor unresolved; patent nd/νd coordinate)