A periscopic 12× zoom cell phone camera lens with eight million pixels comprises a first lens set arranged between an object side and an imaging surface, a second lens set arranged between the first lens set and the imaging surface, a third lens set arranged between the second lens set and the imaging surface, and an image sensor fixed at the imaging surface. The first lens set includes a prism, a first lens, and a second lens. The second lens set includes a third lens and a fourth lens. The third lens set includes a fifth lens. The light path is turned 90° due to the prism so that the length of the prism is equal to a thickness of the cell phone camera lens and the 60 mm length of the cell phone camera lens may be assembled in the cell phone to achieve 12× zoom.

An imaging lens system includes a first group having positive power and a second group having positive power disposed in that order from an object side to an image. The first group includes a first sub-group and a second sub-group. The second group includes a third sub-group, a stop, and a fourth sub-group. Conditional expressions (1), (2), and (3) below are satisfied:
0.07<f2/f1<0.4  (1);
0.45<f2/f2a<0.7  (2); and
1.05<f/R1aN<1.55  (3) where f denotes a focal length of an entirety of the imaging lens system focused at infinity, f1 denotes a focal length of the first group, f2 denotes a focal length of the second group focused at infinity, f2a denotes a focal length of the third sub-group focused at infinity, and R1aN denotes a radius of curvature of a surface closest to the image side within the first sub-group.

An imaging lens system includes a first group having positive power and a second group having positive power disposed in that order from an object side to an image. The first group includes a first sub-group and a second sub-group. The second group includes a third sub-group, a stop, and a fourth sub-group. Conditional expressions (1), (2), and (3) below are satisfied:
0.07<f2/f1<0.4  (1);
0.45<f2/f2a<0.7  (2); and
1.05<f/R1aN<1.55  (3) where f denotes a focal length of an entirety of the imaging lens system focused at infinity, f1 denotes a focal length of the first group, f2 denotes a focal length of the second group focused at infinity, f2a denotes a focal length of the third sub-group focused at infinity, and R1aN denotes a radius of curvature of a surface closest to the image side within the first sub-group.

Provided are a zoom lens comprising, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, in which distances between the respective lens groups are changed to change magnification, the first lens group consists of one single lens having spherical surfaces on both sides, the single lens is a positive meniscus lens having a convex shape toward the object side, at a time of magnification change from a wide-angle end to a telephoto end, the second lens group moves along a path convex toward the image side, and a predetermined conditional expression is satisfied, and an imaging apparatus including the zoom lens.

Provided are a zoom lens comprising, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, in which distances between the respective lens groups are changed to change magnification, the first lens group consists of one single lens having spherical surfaces on both sides, the single lens is a positive meniscus lens having a convex shape toward the object side, at a time of magnification change from a wide-angle end to a telephoto end, the second lens group moves along a path convex toward the image side, and a predetermined conditional expression is satisfied, and an imaging apparatus including the zoom lens.

A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a first intermediate lens group having positive refractive power, a second intermediate lens group having negative refractive power and a rear lens group; upon varying a magnification from a wide angle end state to a telephoto end state, a distance between the first lens group and the first intermediate lens group being varied, a distance between the first intermediate lens group and the second intermediate lens group being varied, and a distance between the second intermediate lens group and the rear lens group being varied; the rear lens group comprising at least one focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expressions being satisfied, thereby the focusing lens group(s) being reduced in weight.

A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a first intermediate lens group having positive refractive power, a second intermediate lens group having negative refractive power and a rear lens group; upon varying a magnification from a wide angle end state to a telephoto end state, a distance between the first lens group and the first intermediate lens group being varied, a distance between the first intermediate lens group and the second intermediate lens group being varied, and a distance between the second intermediate lens group and the rear lens group being varied; the rear lens group comprising at least one focusing lens group which is moved upon carrying out focusing from an infinitely distant object to a closely distant object; and predetermined conditional expressions being satisfied, thereby the focusing lens group(s) being reduced in weight.

A lens module includes a printed circuit board, a lens component, and at least two electric conductors. The lens component includes a first lens and a microscope base, the first lens is formed on the microscope base, the microscope base is formed on the printed circuit board, and the first lens is electrically conductive and deforms under voltage. The first lens is electrically connected to the printed circuit board by the electric conductors. The printed circuit board outputs a voltage to the first lens through the electric conductors; the first lens deforms according to the voltage thereby changing a focal distance of light passing through the first lens. The disclosure also relates to an electronic device using the lens module. The lens module can has a zoom function and has a litter volume.

A lens module includes a printed circuit board, a lens component, and at least two electric conductors. The lens component includes a first lens and a microscope base, the first lens is formed on the microscope base, the microscope base is formed on the printed circuit board, and the first lens is electrically conductive and deforms under voltage. The first lens is electrically connected to the printed circuit board by the electric conductors. The printed circuit board outputs a voltage to the first lens through the electric conductors; the first lens deforms according to the voltage thereby changing a focal distance of light passing through the first lens. The disclosure also relates to an electronic device using the lens module. The lens module can has a zoom function and has a litter volume.

A lens attachment module is configured for coupling with a zoom module of a finite conjugate optical assembly. The lens attachment module includes a lens assembly that has a positive focal length, and exhibits a pupil size of between 16 and 25 mm and a pupil depth greater than 50 mm.