Olympus Corporation

Olympus Imaging Corporation

Kento Hara

Toshio Takahashi

Tadashi Hirata

Hiroshi Kodama

Yasuji Ogata

Yasuharu Yamada

Kazumi Ito

Satoshi Okawa

Akiko Naito

An information acquisition apparatus includes an illuminating section, an image forming optical system, and an image pickup element. The image forming optical system includes an incidence-side lens unit having a positive refractive power, an aperture section, and an emergence-side lens unit having a positive refractive power. The incidence-side lens unit and the emergence-side lens unit include a plurality of positive lenses and at least one negative lens, and the following conditional expressions (1) to (9) are satisfied:&#x2212;6&#x3c;&#x3b2;&#x3c;&#x2212;0.8&#x2003;&#x2003;(1)&#x2212;0.5&#x3c;|&#x3c;3.0&#x2003;&#x2003;(2)&#x2212;1.5&#x3c;|&#x3c;0.5&#x2003;&#x2003;(3)0.001&#x3c;|&#x394;&#x3c;0.05&#x2003;&#x2003;(4)0.04&#x3c;|&#x394;&#x3c;0.28&#x2003;&#x2003;(5)3.5&#x3c;|&#x394;|&#x3c;38.0&#x2003;&#x2003;(6)0&#x3c;|&#x394;|&#x3c;0.27&#x2003;&#x2003;(7)0&#x3c;|&#x394;|&#x3c;0.16&#x2003;&#x2003;(8)0&#x3c;|&#x394;|&#x3c;1.1&#x2003;&#x2003;(9).

Information acquisition apparatus

A telephoto lens includes in order from an object side, a first unit having a positive refractive power, a second unit having a negative refractive power, and a third unit having a positive refractive power, and a focusing from an infinite object point to an object point at a short distance is carried out by moving the second unit toward an image side, and the following conditional expression (17) is satisfied:0.2&#x3c;&#x3c;0.32&#x2003;&#x2003;(17)

Telephoto lens and image pickup apparatus using the same

A lens system, from an object side to an image side in the following order, includes; an object-side lens group that is disposed closest to the object side and having positive refractive power; a focusing lens group that moves during a focusing operation and having negative refractive power; a third lens group; a wobbling lens group that vibrates in an optical axis direction; and an image-side lens group that is disposed closest to the image side.

Lens system and image pickup device equipped with the same

A photographing apparatus comprising: a focus adjustment lens which is provided within a lens barrel containing a photographing lens and is movable in an optical axis direction; a ring member disposed rotatably with respect to the lens barrel in an angle range from a first end point to a second end point; a storage unit to store a first relationship between a rotation angle of the ring member and a distance, and a second relationship between a position of the focus adjustment lens in the optical axis direction and the distance; and a control unit to calculate a distance corresponding to a rotation angle of the ring member according to a rotation angle of the ring member and the first relationship, and to set a position of the focus adjustment lens in the optical axis direction according to the distance and the second relationship.

Photographing apparatus and interchangeable lens control method

A lens system, from an object side to an image side in the following order, at least includes: a fixed object-side lens group that is disposed closest to the object side; a first focusing lens group that moves during a focusing operation and includes a plurality of lenses; a second focusing lens group that moves during a focusing operation and includes a plurality of lenses; a wobbling lens group that has a smaller thickness on an optical axis than the thickness on the optical axis of the first focusing lens group and the thickness on the optical axis of the second focusing lens group, and vibrates in an optical-axis direction; and a fixed image-side lens group that is disposed closest to the image side.

A zoom lens includes a frontmost lens unit, which is located closest to the object side and a plurality of lens units located closer to the image side than the frontmost lens unit. All the distances between adjacent lens units vary during zooming in the state in which the zoom lens is focused on an object at infinity. One of the plurality of lens units is a first focusing lens unit. During focusing from an object at infinity to an object at a short distance in a first shooting mode, only the first focusing lens unit moves. During focusing from an object at infinity to an object at a short distance in a second shooting mode, two lens units in the zoom lens move.

Zoom lens and image pickup apparatus equipped with same

A taking lens system comprises a frontmost lens unit, a rearmost lens unit, and a plurality of lens units arranged between the frontmost lens unit and the rearmost lens unit. One of the plurality of lens units is a first focusing lens unit. During focusing from an infinite object distance to a close object distance, only the first focusing lens unit moves toward the image side in a first shooting mode, and at least two lens units in the taking lens system move in a second shooting mode. In the state in which the taking lens system is focused on an object at infinity, the positions of the first focusing lens unit and at least one lens unit in the taking lens system in the first shooting mode are different from those in the second shooting mode. The taking lens system satisfies the condition M&#x3e;M.

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Tokyo, Japan

Kento Hara