Rear focus type zoom lens including optical view finder integral therewith

摘要

A rear focus type zoom lens including four sections respectively constituted by an objective lens (51), a magnification varying lens (52), a transmission lens (54) and an image focusing lens (55) arranged in this order such that the objective lens is disposed at the frontmost position, the zoom lens further including a beam splitter (56) disposed between a rearmost lens component of the image focusing lens and an image focusing surface (57) and adapted to separate a part of light incident thereon so that an optical view finder system is integral with an image pickup system. This construction makes it possible to prevent a parallax occurring in a case including a separate view finder. Since the overall construction of the zoom lens is common to the view finder, no separate objective lens is required in the view finder system. The zoom lens enables compactness and lightness of the optical view finder system because it is of the rear focus type, as compared to those of the existing front focus type. In particular, the rear focus type zoom lens makes it possible to view a clear image even at a bright place because light adjusted in amount by the iris (53) is incident on the viewer's eye.