Nittoh Inc.

Theia Technologies LLC

Nittoh Kogaku K.k.

Kazuhiro Oe

Jeffrey Alan Gohman

A lens for filming includes a plurality of movable lenses arranged apart from each other in the direction of an optical axis, and which move in the direction of the optical axis for focusing, and a fixed lens, which does not move, is provided between at least one pair of lenses adjacent to each other among them.

Lens for filming

A zoom lens system includes: a primary image forming lens group that forms light from an object side into an intermediate image and a relay lens group that forms light from the intermediate image into a final image. The primary image forming lens group includes, in order from the object side, a first fixed lens group Gwith negative refractive power, a stop St, and a second fixed lens group Gwith positive refractive power, and the relay lens group includes, in order from the object side, a third fixed lens group Gwith negative refractive power, a first moving lens group Gwith positive refractive power, and a second moving lens group Gwith positive refractive power.

Zoom lens system and imaging apparatus

There is provided a lens system includes a first optical system and forms an intermediate image, which has been formed inside the first optical system by light from an input side, into a final image. The first optical system includes a first subsystem, with the first subsystem including a first lens that is disposed at a position closest to the intermediate image on the input side and moves during focusing and a second lens that is disposed at a position closest to the intermediate image on the output side and moves during focusing.

Lens system and imaging apparatus having adjacent stop and fixed lens system at an output side

Lens system and imaging apparatus having a lens at each side of an intermediate image which move in synchronization during focusing

A zoom lens system includes: a primary image forming lens group that forms light from an object side into an intermediate image and a relay lens group that forms light from the intermediate image into a final image. The primary image forming lens group includes, in order from the object side, a first fixed lens group G1 with negative refractive power, a stop St, and a second fixed lens group G2 with positive refractive power, and the relay lens group includes, in order from the object side, a third fixed lens group G3 with negative refractive power, a first moving lens group G4 with positive refractive power, and a second moving lens group G5 with positive refractive power.

A lens system includes, in order from an object side, a first lens group with positive refractive power, a second lens group with negative refractive power that moves during zooming, a third lens group with positive refractive power, and a fourth lens group with positive refractive power that moves during zooming and focusing adjustments. The first lens group includes a lens with positive refractive power and an Abbe number vdthat satisfies a following condition (vd&#x3e;80). The second lens group includes a lens with positive refractive power and an Abbe number vdand two lenses with negative refractive power and Abbe numbers vdand vdrespectively, the Abbe numbers Vd, Vdand Vdsatisfying following conditions (vd, vd, vd&#x3c;23). The third lens group includes a plurality of lenses with positive refractive power, an average vdof the Abbe numbers of the plurality of lenses with positive refractive power satisfies a following condition (77.5&#x3c;vd&#x3c;82.5), and a sum ndts of thermo-optical coefficients of the plurality of lenses with positive refractive power in a temperature range of 40&#xb0; C. to 60&#xb0; C. satisfies a following condition (&#x2212;12.8&#xd7;10&#x3c;ndts&#x3c;&#x2212;2.4&#xd7;10).

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Suwa, Japan

Kazuhiro Oe