Zoom optical system, image pickup optical system, and image pickup apparatus using the same

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to an object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit having a positive refractive power and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes a positive lens and a negative lens, and
• a distance between the first intermediate unit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or a time of focusing, and
• the second intermediate unit moves toward the image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens and a negative lens, and
• a motion blur correction lens unit is included between the first intermediate unit and an image plane, and
• an image blur is corrected by the motion blur correction lens unit being moved in a direction perpendicular to an optical axis, and
• the following conditional expression (1) is satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end, and
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane.

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to an object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit having a positive refractive power and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes a positive lens and a negative lens, and
• a distance between the first intermediate unit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or at a time of focusing, and
• the second intermediate unit moves toward the image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens and a negative lens, and
• a motion blur correction lens unit is included between the first intermediate unit and an image plane, and
• an image blur is corrected by the motion blur correction lens unit being moved in a direction perpendicular to an optical axis, and
• the following conditional expressions (1) and (2′) are satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• 2.5≤KMBT≤20.0 (2′)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end,
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane,
• KMBT=|MGMBTback2×(MGMBT2−1)|, where
• MGMBTback denotes a lateral magnification of a first predetermined optical system at the telephoto end,
• MGMBT denotes a lateral magnification of the second intermediate unit at the telephoto end, and here
• the first predetermined optical system is an optical system which includes all lenses positioned on the image side of the second intermediate unit, and
• the lateral magnification is a lateral magnification at a time of infinite object point focusing.

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to the object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit, and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes in order from the object side, a first sub unit having a positive refractive power and a second sub unit having a positive refractive power, and
• the first intermediate unit as a whole, includes a positive lens and a negative lens, and
• a distance between the first sub unit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or at a time of focusing, and
• the second intermediate unit moves toward the image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens, and
• a motion blur correction lens unit having a negative refractive power is included between the first sub unit and an image plane, and
• an image blur is corrected by the motion blur correction lens unit being moved in a direction perpendicular to an optical axis, and
• the following conditional expressions (1) and (2a) are satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• 4.4≤KMBT≤20.0 (2a)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end,
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane,
• KMBT=|MGMBTback2×(MGMBT2−1)|, where
• MGMBTback denotes a lateral magnification of a first predetermined optical system at the telephoto end,
• MGMBT denotes a lateral magnification of the second intermediate unit at the telephoto end, and here
• the first predetermined optical system is an optical system which includes all lenses positioned on the image side of the second intermediate unit, and
• the lateral magnification is a lateral magnification at a time of infinite object point focusing.

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to an object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit, and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes in order from the object side, a first sub unit having a positive refractive power and a second sub unit having a positive refractive power, and the first intermediate unit as a whole, includes a positive lens and a negative lens, and
• a distance between the first sub unit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or at a time of focusing, and
• the second intermediate unit moves toward the image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens, and
• a motion blur correction lens unit having a negative refractive power is included between the first sub unit and an image plane, and
• an image blur is corrected by the motion blur correction lens unit being moved in a direction perpendicular to an optical axis, and
• in a lens unit which includes the motion blur correction lens unit, a position is fixed at the time of zoom and at the time of focusing, and
• the following conditional expression (1) is satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end, and
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane.

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to an object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit, and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes in order from the object side, a first sub unit having a positive refractive power and a second sub unit having a positive refractive power, and the first intermediate unit as a whole, includes a positive lens and a negative lens, and
• a distance between the first sub unit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or at a time of focusing, and
• the second intermediate unit moves toward an image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens, and
• a motion blur correction lens unit having a negative refractive power is disposed in the rear-side lens unit, and
• an image blur is corrected by the motion blur correction lens unit being moved in a direction perpendicular to an optical axis, and
• the following conditional expression (1) is satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end, and
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane.

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to an object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit, and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes in order from the object side, a first sub unit having a positive refractive power and a second sub unit having a positive refractive power, and the first intermediate unit as a whole, includes a positive lens and a negative lens, and
• a distance between the first sub unit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or at a time of focusing, and
• the second intermediate unit moves toward an image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens, and
• a motion blur correction lens unit having a negative refractive power is disposed in a lens unit having a positive refractive power in the first intermediate unit, and
• an image blur is corrected by the motion blur correction lens unit being moved in a direction perpendicular to an optical axis, and
• in a lens unit which includes the motion blur correction lens unit, a position is fixed at the time of zooming and at the time of focusing, and
• the following conditional expression (1) is satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end, and
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane.

A zoom optical system, comprising:

• a front-side lens unit which is disposed nearest to an object;
• an intermediate lens unit;
• and
• a rear-side lens unit which is disposed nearest to an image, wherein
• the front-side lens unit includes in order from an object side, a first front unit having a positive refractive power and a second front unit having a negative refractive power, and
• each of the first front unit and the second front unit includes a positive lens and a negative lens, and
• a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end, and
• the intermediate lens unit includes in order from the object side, a first intermediate unit, and a second intermediate unit having a negative refractive power, and
• the first intermediate unit includes in order from the object side, a first sub unit having a positive refractive power and a second sub unit having a positive refractive power, and the first intermediate unit as a whole, includes a positive lens and a negative lens, and
• a distance between the first subunit and the second front unit is narrower at the telephoto end than at the wide angle end, and
• a distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit on an image side varies at a time of zooming or at a time of focusing, and
• the second intermediate unit moves toward an image side at the time of focusing from a far point to a near point, and
• the rear-side lens unit includes a positive lens, and
• the following conditional expressions (1) and (2a′) are satisfied:
• 0.9≤LTLT/LTLW≤1.17 (1)
• 4.7≤KMBT≤20.0 (2a′)
• where,
• LTLW denotes an overall length of the zoom optical system at the wide angle end, and
• LTLT denotes an overall length of the zoom optical system at the telephoto end, and here
• the overall length is a distance from a lens surface positioned nearest to the object up to an image plane,
• KMBT=|MGMBTback2×(MGMBT2−1)|, where
• MGMBTback denotes a lateral magnification of a first predetermined optical system at the telephoto end,
• MGMBT denotes a lateral magnification of the second intermediate unit at the telephoto end, and here
• the first predetermined optical system is an optical system which includes all lenses positioned on the image side of the second intermediate unit, and
• the lateral magnification is a lateral magnification at a time of infinite object point focusing.

An image pickup optical system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lenses, wherein
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the following conditional expressions (21b) and (22b) are satisfied:
• 0.12≤LconT/LT≤0.3 (21b)
• 1.65≤LconT/FbT≤3.5 (22b)
• where,
• LconT denotes a predetermined distance at a time of infinite object point focusing in the second state,
• LT denotes an overall length of the image pickup optical system at the time of infinite object point focusing in the first state,
• FbT denotes a back focus of the image pickup optical system at the time of infinite object point focusing in the first state, and here
• the predetermined distance is a distance from a lens surface positioned nearest to an object of the converter lens up to an image plane in a state in which the focal length of the master optical system becomes the maximum,
• the overall length is a distance from a lens surface positioned nearest to the object of the image pickup optical system up to the image plane in the state in which the focal length of the master optical system becomes the maximum,
• the back focus is a back focus in a state in which the focal length of the master optical system becomes the maximum,
• the first state is the state in which the converter lens has not been inserted into the predetermined space, and
• the second state is a state in which the converter lens has been inserted into the predetermined space.

An image pickup optical system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lenses, wherein
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the following conditional expression (23b) is satisfied:
• −5.0≤FbT/RtconR≤0.5 (23b)
• where,
• FbT denotes a back focus of the image pickup optical system at a time of infinite object point focusing in the first state, and
• RtconR denotes a radius of curvature of a lens surface of the converter lens, which is positioned nearest to the image, and here
• the back focus is a back focus in a state in which the focal length of the master optical system becomes the maximum,
• the first state is a state in which the converter lens has not been inserted into the predetermined space, and
• the second state is a state in which the converter lens has been inserted into the predetermined space.

An image pickup optical system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lenses, wherein
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the following conditional expressions (21b′) and (24b) are satisfied:
• 0.1≤LconT/LT≤0.44 (21b′)
• 0.1≤FbT/RtconF≤2.4 (24b)
• where,
• LconT denotes a predetermined distance at a time of infinite object point focusing in the second state,
• LT denotes an overall length of the image pickup optical system at the time of infinite object point focusing in the first state,
• FbT denotes a back focus of the image pickup optical system at the time of infinite object point focusing in the first state, and
• Rtconf denotes a radius of curvature of a lens surface of the converter lens, which is positioned nearest to an object, and here
• the predetermined distance is a distance from a lens surface positioned nearest to the object of the converter lens up to an image plane in a state in which the focal length of the master optical system becomes the maximum,
• the overall length is a distance from a lens surface positioned nearest to the object of the image pickup optical system up to the image plane in the state in which the focal length of the master optical system becomes the maximum,
• the back focus is a back focus in the state in which the focal length of the master optical system becomes the maximum,
• the first state is a state in which the converter lens has not been inserted into the predetermined space, and
• the second state is a state in which the converter lens has been inserted into the predetermined space.

An image pickup optical system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lenses, wherein
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the following conditional expressions (23b′) and (24b′) are satisfied:
• −5.0≤FbT/RtconR≤1.0 (23b′)
• 0.1≤FbT/RtconF≤2.65 (24b′)
• where,
• FbT denotes a back focus of the image pickup optical system at a time of infinite object point focusing in the first state,
• RtconF denotes a radius of curvature of a lens surface of the converter lens, which is positioned nearest to an object, and
• RtconR denotes a radius of curvature of a lens surface of the converter lens, which is positioned nearest to the image, and here
• the back focus is a back focus in a state in which the focal length of the master optical system becomes the maximum,
• the first state is a state in which the converter lens has not been inserted into the predetermined space, and
• the second state is a state in which the converter lens has been inserted into the predetermined space.

An image pickup optical system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lens components, wherein
• in the lens component, only a side of incidence and a side of emergence are air-contact surfaces, and
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the converter lens is a teleconverter lens, and
• the teleconverter lens includes an object-side lens component having a positive refractive power, an image-side lens component which includes a positive lens, and an intermediate lens component having a negative refractive power, and
• the object-side lens component is positioned nearest to an object, and
• the image-side lens component is positioned nearest to the image, and
• the intermediate lens component is positioned between the object-side lens component and the image side lens component, and
• the negative refractive power of the intermediate lens component is the largest of all the lens components having a negative refractive power, and
• the following conditional expression (26b) is satisfied:
• 1.2≤|fconLCObj/fconLCM2|≤4.0 (26b)
• where,
• fconLCObj denotes a focal length of the object-side lens component,
• fconLCM2 denotes a focal length of the intermediate lens component,
• the first state is a state in which the converter lens has not been inserted into the predetermined space, and
• the second state is a state in which the converter lens has been inserted into the predetermined space.

An image pickup system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lenses, wherein
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the converter lens is a teleconverter lens, and
• the teleconverter lens includes an object-side sub unit having a positive refractive power, an intermediate sub unit, and an image-side sub unit having a negative refractive power, and
• the object-side sub unit is positioned nearest to an object, and
• the intermediate sub unit is positioned on an image side of the object-side sub unit, and
• the image-side sub unit is positioned on the image side of the intermediate sub unit, and
• a lens surface on an object side of the object-side sub unit is a surface which is convex toward the object side, and
• the image-side sub unit includes a positive lens and a negative lens, and
• the following conditional expression (16) is satisfied:
• 0.7≤|fconLCOB/fconLCB|≤3.5 (16)
• where,
• fconLCOB denotes a focal length of the object-side sub unit,
• fconLCB denotes a focal length of the image-side sub unit,
• the first state is a state in which the converter lens has not been inserted into the predetermined space, and
• the second state is a state in which the converter lens has been inserted into the predetermined space.

An image pickup optical system, comprising:

• a master optical system;
• and
• a converter lens which includes a plurality of lenses, wherein
• the master optical system includes a rear-side lens unit which is disposed nearest to an image, and of which a position is fixed all the time, and
• the rear-side lens unit includes a third sub unit and a fourth sub unit, and
• a predetermined space for putting in and out the converter lens, is provided between the third sub unit and the fourth sub unit, and
• a focal length of the master optical system differs in a first state and in a second state, and
• an overall length of the master optical system is same in the first state and in the second state, and
• the converter lens is a teleconverter lens, and
• the teleconverter lens includes an object-side sub unit having a positive refractive power, an intermediate sub unit, and an image-side sub unit having a negative refractive power, and
• the object-side sub unit is positioned nearest to an object, and
• the intermediate sub unit is positioned on an image side of the object-side sub unit, and
• the image-side sub unit is positioned on the image side of the intermediate sub unit, and
• a lens surface on an object side of the object-side sub unit is a surface which is convex toward the object side, and
• the image-side sub unit includes a positive lens and a negative lens, and
• the following conditional expression (17) is satisfied:
• 2.0≤(fT/FnoT)/LTC≤6.0 (17)
• where,
• fT denotes a focal length of the image pickup optical system in the first state,
• FnoT denotes an F-number of the master optical system at the time of infinite object point focusing, and
• LTC denotes a distance from a lens surface positioned nearest to the object of the converter lens up to a lens surface positioned nearest to the image of the converter lens, and here
• the focal length and the F-number are a focal length and an F-number in a state in which the focal length of the master optical system becomes the maximum,
• the first state is a state in which the converter lens has not been inserted into the predetermined space, and
• the second lens is a state in which the converter lens has been inserted into the predetermined space.