WIDE ANGLE LENS AND IMAGING APPARATUS

摘要

A wide angle lens includes: a positive first lens group, a second lens group, constituted by two or fewer lenses, that moves during focusing operations, and a third lens group that includes at least one positive lens, provided in this order from the object side. The first lens group includes at least a positive meniscus lens with a convex surface toward the object side, a negative meniscus lens with a convex surface toward the object side, a lens having a concave surface with a radius of curvature having a smaller absolute value toward the image side, a negative lens, a cemented lens formed by a positive lens and a negative lens, and an aperture stop provided adjacent to the cemented lens toward the image side thereof, provided in this order from the object side. The wide angle lens satisfies a predetermined conditional formula.

主权项

1. A wide angle lens, substantially consisting of three lens groups, which are:
a first lens group having a positive refractive power which is fixed in the direction of an optical axis during focusing operations; a second lens group that moves along the optical axis during focusing operations; and a third lens group which is fixed in the direction of the optical axis during focusing operations, provided in this order from an object side; the first lens group comprising: a first lens having a positive refractive power and is of a meniscus shape having a convex surface toward the object side; a second lens having a negative refractive power and is of a meniscus shape having a convex surface toward the object side; a third lens having a negative refractive power and a concave surface with a radius of curvature having the smaller absolute value toward an image side; and a fourth lens having a negative refractive power, provided in this order from the object side; the wide angle lens further comprising: a cemented lens formed by cementing a lens having a positive refractive power and a lens having a negative refractive power together, provided more toward the image side than the fourth lens; and an aperture stop provided adjacent to the cemented lens toward the image side thereof; the second lens group substantially consisting of two or fewer lenses; the third lens group comprising at least one positive lens; and the wide angle lens satisfying the following conditional formula:
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