Zoom optical system and image pickup apparatus using the same

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit,
• the image-side positive lens unit is disposed closest to an image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to an object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit, and
• the following Conditional Expressions (23-1), (25-1), (17-3), and (30) are satisfied:
• 0.6≤FNOw≤3.9 (23-1),
• 0.0≤ft/fw+13.38×tan(ΩHw/2)−21.0≤350 (25-1),
• 35.5°≤ΩHw/2≤88.0° (17-3), and
• 3.15 mm≤Rimg≤40.0 mm (30)
• where
• FNOw is an F-number at the wide angle end,
• ft is a focal length of the zoom optical system at the telephoto end,
• fw is a focal length of the zoom optical system at the wide angle end,
• ΩHw is a total angle of view in a horizontal direction at the wide angle end, and
• Rimg is a radius of an image circle at an image pickup element.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit, and includes a predetermined positive lens satisfying the following Conditional Expression (2),
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens, and
• the following Conditional Expression (1) is satisfied:
• 0.1≤fGBUN1/fGPM≤2.1 (1), and
• 60.8≤νdGPMP1≤100.0 (2)
• where
• fGBUN1 is a focal length of the first sub-lens unit,
• fGPM is a focal length of the positive lens unit,
• νdGPMP1 is an Abbe number of the predetermined positive lens,
• the predetermined positive lens is a positive lens with the largest Abbe number among positive lenses of the positive lens unit, and
• a lens component is a single lens or a cemented lens.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit,
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens, and
• the following Conditional Expressions (3) and (4) are satisfied:
• 0.02≤DGBUN12a/fGBUN1≤4.0 (3), and
• 0.43≤|(MGGBUN1back)×(MGGBUN1−1)|≤5.0 (4)
• where
• DGBUN12a is an air space between the first sub-lens unit and the second sub-lens unit,
• fGBUN1 is a focal length of the first sub-lens unit,
• MGGBUN1 is a lateral magnification in the first sub-lens unit,
• MGGBUN1back is lateral magnification in the predetermined optical system,
• the predetermined optical system is an optical system formed of all the lenses disposed closer to the image side than the first sub-lens unit is,
• the lateral magnification is lateral magnification at a time of focusing to an object at infinity, and
• a lens component is a single lens or a cemented lens.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit, and includes a predetermined positive lens satisfying the following Conditional Expression (2-1),
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens, and
• the following Conditional Expression (5) is satisfied:
• 64.8≤νdGPMP1≤100.0 (2-1), and
• −2.6≤SFGBUN1≤0.95 (5)
• where
• νdGPMP1 is an Abbe number of the predetermined positive lens,
• the predetermined positive lens is a positive lens with the largest Abbe number among positive lenses of the positive lens unit,
• SFGBUN1 is indicated with the following expression:
• SFGBUN1=(RGBUN1f+RGBUN1r)/(RGBUN1f−RGBUN1r),
• RGBUN1f is a radius of curvature of a lens surface disposed closest to the object side among the first sub-lens unit, and
• RGBUN1r is a radius of curvature of a lens surface disposed closest to the image side among the first sub-lens unit, and
• a lens component is a single lens or a cemented lens.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit,
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens,
• a space between the image-side positive lens unit and the lens unit disposed adjacent to the image-side positive lens unit is changed at a time of zooming,
• a lens surface disposed closest to the image side among the first sub-lens unit is a surface convex on the image side, and
• the following Conditional Expressions (6), (7), and (8) are satisfied:
• 2.0≤fGPM/fw≤20.0 (6),
• 2.3≤fGBUN1/fw≤9.7 (7), and
• 3.0≤|LTLmax/fGN1|≤16.3 (8)
• where
• fGPM is a focal length of the positive lens unit,
• fGBUN1 is a focal length of the first sub-lens unit,
• fw is a focal length of the zoom optical system at the wide angle end,
• LTLmax is a maximum whole length among whole lengths of the zoom optical system,
• fGN1 is a focal length of the object-side negative lens unit, and
• a lens component is a single lens or a cemented lens.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit, and includes a predetermined positive lens satisfying the following Conditional Expression (2-2),
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens, and
• the following Conditional Expressions (17-1) and (5-2) are satisfied:
• 60≤νdGPMP1≤100.0 (2-2),
• 31.9°≤Mw/2≤88.0° (17-1), and
• −1.91≤SFGBUN1≤0.95 (5-2)
• where
• νdGPMP1 is an Abbe number of the predetermined positive lens, and
• the predetermined positive lens is a positive lens with the largest Abbe number among positive lenses of the positive lens unit,
• ΩHw is a total angle of view at the wide angle end,
• SFGBUN1 is indicated with the following expression:
• SFGBUN1=(RGBUN1f)+(RGBUN1r)/(RGBUN1f−RGBUN1),
• RGBUN1f is a radius of curvature of a lens surface disposed closest to the object side among the first sub-lens unit, and
• RGBUN1r is a radius of curvature of a lens surface disposed closest to the image side among the first sub-lens unit.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit,
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens, and
• the following Conditional Expressions (17-1) and (1) are satisfied.
• 31.9°≤ΩHw/2≤88.0° (17-1), and
• 0.1≤fGBUN1/fGPM≤2.1 (1)
• where
• ΩHw is a total angle of view in a horizontal direction at the wide angle end,
• fGBUN1 is a focal length of the first sub-lens unit, and
• fGPM is a focal length of the positive lens unit.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit,
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens,
• the aperture stop is moved only in one direction along the optical axis or not moved at a time of zooming, and
• the following Conditional Expressions (17-1) and (8-1) are satisfied:
• 31.9°≤ΩHw≤88.0° (17-1), and
• 1.0≤|LTLmax/fGN1|≤19.0 (8-1)
• where
• ΩHw is a total angle of view in a horizontal direction at the wide angle end,
• LTLmax is a maximum whole length among whole lengths of the zoom optical system, and
• fGN1 is a focal length of the object-side negative lens unit.

A zoom optical system comprising:

• a plurality of lens units;
• and
• an aperture stop, wherein
• the plurality of lens units consist of two or more lens units having a positive refractive power, and one or two or more lens units having a negative refractive power,
• the two or more lens units having a positive refractive power include a positive lens unit having a positive refractive power, and an image-side positive lens unit,
• the one or two or more lens units having a negative refractive power include an object-side negative lens unit,
• the image-side positive lens unit is not moved along an optical axis at a time of zooming or at a time of focusing,
• in the plurality of lens units, a space between the lens units disposed adjacently is changed at a time of zooming, at a time of focusing, or at a time of zooming and at a time of focusing,
• the positive lens unit has the largest refractive power among the two or more lens units having a positive refractive power excluding the image-side positive lens unit,
• the image-side positive lens unit is disposed closest to the image side among the two or more lens units having a positive refractive power,
• when the plurality of lens units include two or more lens units having a negative refractive power, the object-side negative lens unit is disposed closest to the object side among the one or two or more lens units having a negative refractive power,
• the object-side negative lens unit is moved such that a space between the object-side negative lens unit and the positive lens unit at a time of focusing to an object at infinity is narrower at a telephoto end than that at a wide angle end,
• the aperture stop is disposed between a lens surface disposed closest to the image side in the object-side negative lens unit and a lens surface disposed closest to the image side in the positive lens unit, or adjacent to the lens surface disposed closest to the image side in the positive lens unit,
• the image-side positive lens unit includes a first sub-lens unit having a positive refractive power, and a second sub-lens unit including a positive lens and a negative lens,
• the aperture stop is moved only in only direction along the optical axis or not moved at a time of zooming, and
• the following Conditional Expressions (17-1) and (5-1) are satisfied:
• 31.9°≤ΩHw≤2≤88.0° (17-1), and
• −2.0≤SFGBUN1≤0.95 (5-1)
• where
• ΩHw is the total angle of view at the wide angle end,
• SFGBUN1 is indicated with the following expression:
• SFGBUN1=(RGBUN1f)+(RGBUN1r)/(RGBUN1f−RGBUN1),
• RGBUN1f is a radius of curvature of a lens surface disposed closest to the object side among the first sub-lens unit, and
• RGBUN1r is a radius of curvature of a lens surface disposed closest to the image side among the first sub-lens unit.