A situation grasping means configured to grasp a situation of a moving body, an optical system mounted on the moving body, and a focusing group configured to change an imaging position of the optical system are provided, and the imaging position is changed to a position calculated from a setting value for setting the imaging position according to a situation of the moving body and a situation of the moving body grasped by the situation grasping means, and the optical system satisfies a predetermined conditional expression. Furthermore, the moving body includes the imaging apparatus.

Pop-out lens systems for compact digital cameras, comprising an image sensor and a lens with a field of view FOV>60 deg and having i lens elements L1-Li starting with L1 from an object side toward an image side, each lens element Li having a respective focal length f.sub.i, the lens elements divided into two lens groups G1 and G2 separated by a big gap (BG), the lens having a pop-out total track length TTL<20 mm in a pop-out state and a collapsed total track length c-TTL in a collapsed state, wherein BG>0.25×TTL, wherein either G1 can move relative to G2 and to the image sensor for focusing or G1 and G2 can move together relative to the image sensor for focusing, and wherein a ratio c-TTL/TTL<0.7.

An imaging lens system consists of: a first lens group; an aperture stop; and a second lens group having positive power. The first lens group includes: a first lens having negative power; a second lens having negative power; and a sub-lens group having positive power. The first lens is a negative meniscus lens having a surface convex toward an object. The second lens is a negative meniscus lens having a surface convex toward the object. The imaging lens system satisfies the following inequalities (1) and (2):

0.35<T2/R2<4.0  (1)

3.0<T4/R4<10.0  (2).

A variable-power optical system (ZL) comprises a first lens group (G1) having a negative refractive power and a succeeding lens group (GR), which are disposed on an optical axis in that order from the object side. When varying magnification from wide angle to telephoto, the space between the adjacent lens groups changes. The succeeding lens group (GR) comprises: a first focusing lens group (G3) having a positive refractive power; and a second focusing lens group (G5) having a positive refractive power. When focusing from infinity to a proximate distance, the first focusing lens group (G3) moves toward the object side, and the second focusing lens group (G5) moves toward the image side.

An optical system LO includes in this order from an object side to an image side, a first lens unit FL, an aperture stop SP, and a second lens unit RL having a positive refractive power. The first lens unit FL includes at least three negative lenses including in order from the object side to the image side, negative lenses (G1N), (G2N), and (G3N). At least one lens surface of the negative lenses (G1N), (G2N), and (G3N) is an aspherical surface that satisfies a predetermined conditional inequality.

Provided is an optical system and an imaging apparatus provided with the optical system. The optical system includes: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having positive refractive power, the first lens, the second lens, the third lens, and the fourth lens being disposed in this order from an object side. The optical system satisfies a predetermined condition relating to the focal length of the optical system and the distance on the optical axis between an exit pupil and an imaging plane in the optical system.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear unit having a positive refractive power as a whole. A distance between the first lens unit and the rear unit is changed during zooming. The rear unit includes a subunit that is moved in a direction having a component of a direction orthogonal to an optical axis during image stabilization. The first lens unit includes, in order from the object side to the image side, three or more negative lenses. A predetermined condition is satisfied.

An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions,

ndLZ+(0.01425×νdLZ)<2.12, and

0.702<θgFLZ+(0.00316×νdL=), where ndL: a refractive index of the lens with reference to d-line, νdLZ: Abbe number of the lens with reference to d-line, and θgFLZ: a partial dispersion ratio of the lens, wherein θgFLZ is defined by the following expression,

θgFLZ=(ngLZ−nFLZ)/(nFLZ−nCLZ). wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.

A zoom lens including a movable first lens group and a movable second lens group sequentially arranged along an optical axis from a magnifying side to a reduction side is provided. The first lens group and the second lens group respectively includes at least one lens. The zoom lens meets a condition, and the condition is: a product of a refractive index temperature coefficient and a refractive index temperature coefficient change rate of at least some of the lenses in the first lens group and the second lens group is less than 0. In addition, a manufacturing method of a zoom lens is also provided. The zoom lens and the manufacturing method thereof provided in the invention can achieve favorable and consistent imaging quality in both a high temperature environment and a low temperature environment under different modes.

A zoom lens system includes, in order from the object side to the image side, a first lens group having negative power and a second lens group having positive power. The first lens group includes at least two negative lenses. When zooming, one of the first lens group and the second lens group is fixed relative to the imaging surface, and the other moves along an optical axis to change an angle of view.