Olympus Optical Company, Ltd.

Olympus Corporation

Olympus Imaging Corporation

Yasuji Ogata

Yasuharu Yamada

Hirohiko Kimata

Toshio Takahashi

Kazuteru Kawamura

Yuji Kamo

Takanori Yamanashi

Akiyoshi Tochigi

Toyoki Kon

Hisashi Goto

Masaru Morooka

Tetsuo Nagata

Keitaro Yokoyama

Yasutaka Kashiki

Akiko Naito

Kento Hara

Toshiro Baba

The present disclosure is directed to a converter lens device that includes a first mount to which a master lens device is capable of being attached, a second mount to which a camera body is capable of being attached and a converter lens having a negative refractive power, wherein, an optical system comprising the converter lens device and the master lens device has a focal length longer than a focal length of an optical system of the master lens device, the converter lens comprises sequentially from an object side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, and a third lens unit.

Converter lens device and photographing system including the same

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

Teleconverter, and imaging system comprising the same

A teleconverter includes a master lens apparatus-side mount on which a master lens apparatus is mounted, a camera body-side mount on which a camera body is mounted, and a converter lens unit that has a negative refracting power for mounting the master lens apparatus thereon to obtain a lens system having a focal length longer than that of the master lens apparatus, the converter lens unit including a first lens group on the master lens apparatus side and a second lens group on the camera body side with an on longest air separation interposed between them, the first lens group has positive refracting power, and the second lens group has negative refracting power, with satisfaction of the following condition (1):&#x2212;1.53&#x3c;1/&#x3c;&#x2212;0.66&#x2003;&#x2003;(1)where f is the focal length of a whole system of the converter lens unit, and f1 is the focal length of the first lens group.

Teleconverter mounted on a master lens apparatus to obtain a lens system having a focal length longer than that of the master lens apparatus, and imaging system comprising the same

A teleconverter according to the present invention includes a master lens apparatus side mount portion, an image pickup apparatus side mount portion, and a converter lens section having a negative refractive power as a whole. The converter lens section includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The second lens unit is a lens unit in which, three lenses are cemented, and which includes in order from the object side to the image side, a first lens having a negative refractive power, a second lens having a positive refractive power, and a third lens having a negative refractive power. The teleconverter satisfies predetermined conditional expressions.

Teleconverter and image pickup system using the same

A zoom lens comprises a first lens unit Ghaving a positive refractive power, a second lens unit Ghaving a negative refractive power, a third lens unit Ghaving a positive refractive power, a fourth lens unit Ghaving a negative refractive power, a fifth lens unit G, and a sixth lens unit Ghaving a positive refractive power. Zooming from a wide angle end to a telephoto end is carried out by changing a distance between the lens units, and a distance between the first lens unit Gand the third lens unit Gnarrows at the telephoto end than at the wide angle end, and the first lens unit Gis stationary at the time of zooming from the wide angle end to the telephoto end, and lens units from the second lens unit Gto the fifth lens unit Gmove.

Zoom lens

A zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit. At a telephoto end, with respect to a wide angle end, a distance between the first lens unit and the second lens unit widens, and a distance between the second lens unit and the third lens unit narrows. At the time of zooming from the wide angle end to the telephoto end, a distance between the third lens unit and the fourth lens unit changes, and the zoom lens satisfies the following conditional expressions (1) and (2).1.1&#x3c;&#x3c;1.8&#x2003;&#x2003;(1)&#x2212;0.5&#x3c;&#x394;&#x3c;0.5&#x2003;&#x2003;(2)

Zoom lens and zoom lens apparatus using the same

A teleconverter includes a master lens apparatus-side mount on which a master lens apparatus is mounted, a camera body-side mount on which a camera body is mounted, and a converter lens unit that has a negative refracting power for mounting the master lens apparatus thereon to obtain a lens system having a focal length longer than that of the master lens apparatus, the converter lens unit including a first lens group on the master lens apparatus side and a second lens group on the camera body side with an on longest air separation interposed between them, the first lens group has positive refracting power, and the second lens group has negative refracting power, with satisfaction of the following condition (1):&#x2212;1.53&#x3c;1/&#x2003;&#x2003;(1)where f is the focal length of a whole system of the converter lens unit, and f1 is the focal length of the first lens group.

A zoom lens comprising, in order from the object side to the image side a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, wherein the first lens unit is located closest to the object side, the fifth lens unit is located closest to the image side, during zooming from the wide angle end to the telephoto end, the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit move, the fifth lens unit is stationary, and the distances between the lens units vary, the third lens includes a positive lens, and the zoom lens satisfies the following condition (1):72&#x3c;&#x3bd;&#x3c;110&#x2003;&#x2003;(1).

Zoom lens and image pickup apparatus equipped with same

The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

Zoom lens, and imaging apparatus incorporating the same

In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.

An inner focus lens system includes from the object side, a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power, and a third lens unit. The first lens unit includes a plurality of negative lenses and at least one positive lens, the lens located closest to the object side is a negative lens. The second lens unit includes at least one negative lens and at least one positive lens, and moves toward the object side for focusing from an infinite object distance to a close object distance such that the distance between the second lens unit and the aperture stop decreases and that the distance between the second lens unit and the third lens unit increases. The lens system satisfies the following conditions: 1&#x3c;f/f 14 (1), and 0.8&#x3c;f/f&#x3c;3 (2).

Inner focus lens system and image pickup apparatus using the same

The invention provides a zoom lens, characterized by comprising, in order from an object side thereof,

Growing community of inventors

Tokyo, Japan

Yasuji Ogata