Olympus Corporation

Olympus Imaging Corporation

Tetsuya Yanai

Mayu Miki

Minoru Ueda

Kenji Ono

Tomoyuki Satori

Masato Katayose

Toyoki Kon

Kazuteru Kawamura

Masahiro Imamura

Takashi Fujikura

Daichi Murakami

Yuki Zen

Masahito Watanabe

Keisuke Ichikawa

Yuji Kamo

Yasuharu Yamada

Toshihide Nozawa

Yuki Kubota

Akinori Nishio

Koji Nakagawa

Takeshi Hosoya

Masaki Arakawa

Akiko Naito

A zoom lens includes in order from an object 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. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied:&#x2212;0.015&#x2264;&#x2264;0.015&#x2003;&#x2003;(1),70.3&#x2264;&#x3bd;&#x2003;&#x2003;(2),1.76&#x2264;&#x2264;2.3&#x2003;&#x2003;(3), and0.3&#x2264;||&#x2264;0.9&#x2003;&#x2003;(4).

Zoom lens and image pickup apparatus using the same

A variable magnification optical system includes a plurality of lens element, and includes in order from an object 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 at least one lens unit. An aperture stop is either positioned between the second lens unit and the third lens unit, or positioned in the third lens unit. At the time of zooming from a wide angle end to a telephoto end, the first lens unit is fixed, the second lens unit moves from the object side to an image-plane side, and at least one of lens units positioned on an image side of the aperture stop moves. The first lens unit includes at least four positive lens elements and at least two negative lens elements.

Variable magnification optical system and image pickup apparatus using the same

A variable magnification optical system includes 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 at least one lens unit. A second predetermined positive lens element satisfies conditional expressions (1) and (2) and a second predetermined negative lens element satisfies the following conditional expressions (3) and (4). The second lens unit includes three sub-lens units and the following conditional expressions (5) and (6) are satisfied:0.520&#x3c;(&#x3b8;)2&#x3c;0.610&#x2003;&#x2003;(1),0.680&#x3c;(&#x3b8;)2&#x3c;0.900&#x2003;&#x2003;(2),0.520&#x3c;(&#x3b8;)2&#x3c;0.560&#x2003;&#x2003;(3),0.750&#x3c;(&#x3b8;)2&#x3c;0.900&#x2003;&#x2003;(4),&#x2212;0.25&#x3c;21/22&#x3c;0.90&#x2003;&#x2003;(5), and&#x2212;0.70&#x3c;21/23&#x3c;0.40&#x2003;&#x2003;(6).

A zoom lens with a bent optical path includes, in order from the object side to the image side, a first lens unit including the reflecting member and having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. During zooming from the wide angle end to the telephoto end, the second lens unit moves closer to the first lens unit only toward the object side, the third lens unit moves in such a way that it becomes closest to the second lens unit at an intermediate focal length position in the course of zooming as compared to the state at the wide angle end and the state at the telephoto end, and the fourth lens unit moves. The zoom lens satisfies a certain condition.

Image pickup apparatus equipped with zoom lens with bent optical path

A zoom lens comprises in order from an object side,

A zoom lens includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a negative focal length, and a fifth lens unit having a positive focal length, wherein following Conditional Expressions (1) and (2) are satisfied:0.3&#x2264;3445&#x2264;1&#x2003;&#x2003;(1), and0.2&#x2264;(3445)/(3445)&#x2264;0.6&#x2003;&#x2003;(2).

A zoom lens comprises in order from an object side, a first lens unit having a positive refractive power, and at the time of zooming from a wide angle end to a telephoto end, the first lens unit moves, and the zoom lens satisfies the following conditional expression (1).()&#x3c;1.64&#x2003;&#x2003;(1)

A zoom lens comprises in order from an object side a first lens unit having a positive refractive power. The first lens unit consist one positive lens. The zoom lens satisfies the following conditional expressions (1) and (2).Fno&#x3c;2.7&#x2003;&#x2003;(1)3.1&#x3c;where,

A zoom lens comprises, in order from its object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power. The first lens unit comprises a first lens having a negative refractive power and a second lens having a positive refractive power. The zoom lens satisfies the following conditional expressions (1), (2), and (3):&#x2266;1.70&#x2003;&#x2003;(1),&#x2266;1.70&#x2003;&#x2003;(2), and|&#x3bd;&#x2212;&#x3bd;&#x2267;31&#x2003;&#x2003;(3),where nis the refractive index of the first lens having a negative refractive power in the first lens unit for the d-line, &#x3bd;is the Abbe constant of the first lens having a negative refractive power in the first lens unit, nis the refractive index of the second lens having a positive refractive power in the first lens unit for the d-line, and &#x3bd;is the Abbe constant of the second lens having a positive refractive power in the first lens unit.

Zoom lens and image pickup apparatus equipped with same

A zoom lens includes in order from an object 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 having a positive refractive power, and at the time of zooming, the first lens unit moves, and the zoom lens satisfies the following conditional expressions (1-1a), (1-2a), and (1-3a).0.43&#x3c;(&#x3b2;/&#x3b2;)/(&#x3b2;/&#x3b2;)&#x3c;0.68&#x2003;&#x2003;(1-1a)0.4&#x3c;(&#x394;)/(&#x394;)&#x3c;2.3&#x2003;&#x2003;(1-2a)2.1&#x3c;&#x3c;4.1&#x2003;&#x2003;(1-3a)

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Akiruno, Japan

Tetsuya Yanai