Zoom lens system, imaging device and camera

A zoom lens system, in order from an object side to an image side, comprising a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, and subsequent lens units including a fourth lens unit having optical power, wherein

• any one of the first lens unit, the second lens unit, the third lens unit, and the subsequent lens units includes a lens element having a reflecting surface that bends a light beam incident from an object, wherein
• in zooming from a wide-angle limit to a telephoto limit at the time of image taking, the first lens unit and the third lens unit do not move along an optical axis, and wherein
• at least one of all the lens elements constituting the fourth lens unit satisfies the following conditions (2-1) and (2-2), simultaneously:
• 1.42<nd4<1.66 (2-1)
• 15<vd4<36 (2-2)
• where,
• nd4 is a refractive index to the d-line of any of the lens elements constituting the fourth lens unit, and
• vd4 is an Abbe number to the d-line of any of the lens elements constituting the fourth lens unit.

A zoom lens system, in order from an object side to an image side, comprising a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, a fourth lens unit having optical power, and a fifth lens unit having optical power, wherein

• any one of the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit includes a lens element having a reflecting surface that bends a light beam incident from an object, wherein
• in zooming from a wide-angle limit to a telephoto limit at the time of image taking, the first lens unit, the third lens unit, and the fifth lens unit do not move along an optical axis, wherein
• an aperture diaphragm is arranged between the third lens unit and the fourth lens unit, and wherein
• at least two of all the lens elements constituting the lens system satisfy the following conditions (3-1) and (4-1), simultaneously:
• vd
• <
• 59
• (
• 3
• 
• -
• 
• 1
• )
• when
• 
• 
• vd
• <
• 34
• 0.000
• <
• PgF
• +
• 0.0038
• ×
• vd
• -
• 0.725
• when
• 
• 
• 34
• ≤
• vd
• <
• 59
• 0.000
• <
• PgF
• +
• 0.0020
• ×
• vd
• -
• 0.664
• }
• (
• 4
• 
• -
• 
• 1
• )
• where,
• vd is an Abbe number to the d-line of any of the lens elements constituting the lens system,
• PgF is a partial dispersion ratio of any of the lens elements constituting the lens system, which is represented by the following equation:
• PgF=(ng−nF)/(nF−nC),
• ng is a refractive index to the g-line,
• nF is a refractive index to the F-line, and
• nC is a refractive index to the C-line.

A zoom lens system, in order from an object side to an image side, comprising a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, a fourth lens unit having optical power, and a fifth lens unit having optical power, wherein

• any one of the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit includes a lens element having a reflecting surface that bends a light beam incident from an object, wherein
• in zooming from a wide-angle limit to a telephoto limit at the time of image taking, the first lens unit, the third lens unit, and the fifth lens unit do not move along an optical axis, wherein
• an aperture diaphragm is arranged between the third lens unit and the fourth lens unit, and wherein
• at least one of all the lens elements constituting the third lens unit satisfies the following conditions (3-2) and (4-2), simultaneously:
• vd
• 3
• <
• 59
• (
• 3
• 
• -
• 
• 2
• )
• when
• 
• 
• vd
• 3
• <
• 34
• 0.000
• <
• PgF
• 3
• +
• 0.0038
• ×
• vd
• 3
• -
• 0.725
• when
• 
• 
• 34
• ≤
• vd
• 3
• <
• 59
• 0.000
• <
• PgF
• 3
• +
• 0.0020
• ×
• vd
• 3
• -
• 0.664
• }
• (
• 4
• 
• -
• 
• 2
• )
• where,
• vd3 is an Abbe number to the d-line of any of the lens elements constituting the third lens unit,
• PgF3 is a partial dispersion ratio of any of the lens elements constituting the third lens unit, which is represented by the following equation:
• PgF3=(ng−nF)/(nF−nC),
• ng is a refractive index to the g-line,
• nF is a refractive index to the F-line, and
• nC is a refractive index to the C-line.