Zoom lens, and optical apparatus and method for forming an image of an object using the zoom lens

A method for forming an image of an object that uses a zoom lens which has a plurality of lens groups which are disposed in order from the object along an optical axis, wherein the plurality of the lens groups include

• a first lens group, which is disposed closest to the object among the plurality of lens groups, and has a positive refractive power,
• the first lens group comprises an optical axis bending element for bending the optical axis and a plurality of lens components which are disposed closer to the object than the optical axis bending element,
• the plurality of the lens components are formed of only two lenses,
• the plurality of lens components include a positive lens that satisfies a condition of
• νd50,
• where νd is an Abbe number with respect to the d-line, and
• at least one of the lens groups, which are disposed closer to the image than the first lens group, at least partially includes a shift lens group that can move in a direction substantially perpendicular to the optical axis;
• wherein the plurality of lens components are formed of a negative lens and the positive lens which are disposed in order from the object;
• and
• wherein the negative lens and the positive lens are air-spaced along the optical axis.

A zoom lens comprising a plurality of lens groups which are disposed in order from an object along an optical axis,

• wherein among the plurality of lens groups, a first lens group which is disposed closest to the object has a positive refractive power,
• the first lens group comprises an optical axis bending element for bending the optical axis, and a plurality of lens components which are disposed closer to the object than the optical axis bending element,
• the plurality of lens components are formed of only two lenses,
• the plurality of lens components include a positive lens that satisfies a condition of
• νd50,
• where νd is an Abbe number with respect to d-line, and
• at least one of the lens groups, which are disposed closer to the image than the first lens group, at least partially includes a shift lens group that can move in a direction substantially perpendicular to the optical axis;
• and
• wherein the plurality of lens components are formed of a negative meniscus lens having a convex surface facing the object, and a positive meniscus lens having a convex surface facing the object, which are disposed in order from the object.

A method for forming an image of an object, that comprises providing a zoom lens with a plurality of lens groups which are disposed in order from the object along an optical axis, wherein the plurality of lens groups include

• a first lens group, which is disposed closest to the object among the plurality of lens groups, and has a positive refractive power,
• the first lens group comprising an optical axis bending element for bending the optical axis and a plurality of lens components which are disposed closer to the object than the optical axis bending element,
• the plurality of lens components are formed of only two lenses,
• the plurality of lens components include a positive lens that satisfies a condition of
• νd50,
• where νd is an Abbe number with respect to d-line, and
• at least one of the lens groups, which are disposed closer to the image than the first lens group, at least partially includes a shift lens group that can move in a direction substantially perpendicular to the optical axis;
• and
• wherein the plurality of lens components are formed of a negative meniscus lens having a convex surface facing the object, and a positive meniscus lens having a convex surface facing the object, which are disposed in order from the object.