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Abstract

A wide attachment which is detachably attached to an object side of a lens apparatus and in which a focal length of the lens apparatus is shifted to a short focal length side. The wide attachment is formed of a single meniscus lens having a negative refractive power. The lens has an aspherical surface. The following conditional expressions are satisfied: −5.2<−(r1+r2)/(r1−r2)<−1.3, and 1.501 represents a curvature radius of a surface on an object side of the lens, r2 represents a curvature radius of a surface on an image side of the lens, and nd represents a refractive index of a material constituting the lens with respect to d-line, wherein a curvature radius of the aspherical surface is defined as a curvature radius of a spherical surface passing through a lens vertex and a maximum effective diameter of the aspherical surface.

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First Claim