Zoom lens system, imaging device and camera

Zoom lens system, imaging device and camera

A zoom lens system comprising: a positive first lens unit; a negative second lens unit; a positive third lens unit; a fourth lens unit; and an aperture diaphragm provided between the third lens unit and the fourth lens unit, wherein in zooming, the first to third lens units are moved along an optica...

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1. Verfasser: BITO TAKAKAZU
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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creator BITO TAKAKAZU
description A zoom lens system comprising: a positive first lens unit; a negative second lens unit; a positive third lens unit; a fourth lens unit; and an aperture diaphragm provided between the third lens unit and the fourth lens unit, wherein in zooming, the first to third lens units are moved along an optical axis to perform magnification change, the third lens unit includes two or more lens elements and one or more inter-lens-element air spaces, and the conditions: -7.0
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a negative second lens unit; a positive third lens unit; a fourth lens unit; and an aperture diaphragm provided between the third lens unit and the fourth lens unit, wherein in zooming, the first to third lens units are moved along an optical axis to perform magnification change, the third lens unit includes two or more lens elements and one or more inter-lens-element air spaces, and the conditions: -7.0&lt;f1/f2&lt;-4.0 and fT/fW&gt;9.0 (f1 and f2: composite focal lengths of the first and second lens units, fW and fT: focal lengths of the entire system at a wide-angle limit and a telephoto limit) are satisfied.</abstract><oa>free_for_read</oa></addata></record>
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
title Zoom lens system, imaging device and camera
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