Image pickup apparatus having image pickup optical system

An image pickup apparatus comprising:

• an image pickup optical system comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape which is disposed on the image side of a most image side optical component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis,
• wherein said second lens unit is moved only in a direction from said object side toward an image side to change the magnification from a wide position to a tele position, and
• wherein a third lens unit is disposed successively to said second lens unit, and said third lens unit is kept stationary at a time of a change in magnification.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein a paraxial amount of said image pickup optical system is changed and aberrations are corrected by varying the optical path bending reflecting surface having the variable shape.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein the optical path bending reflecting surface having the variable shape is varied on the basis of lens control data for reducing an influence due to vibrations.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein said image pickup apparatus is configured to control the optical path bending reflecting surface having the variable shape so that an image of a main object is nearly immovable on an image surface during exposure for a long time.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein said image pickup apparatus further comprises a multi-point range finding mechanism, the optical path bending reflecting surface having the variable shape is varied so that the image pickup optical system is brought into focus on each point using data provided from said multi-point range finding mechanism.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein the optical path bending reflecting surface having the variable shape is varied so as to obtain optional aberration conditions in said image pickup optical system.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein said image pickup apparatus comprises an image pickup device, the optical path bending reflecting surface having the variable shape is varied so as to change a focal length of said image pickup lens system in correspondence to a change of said image pickup device.

An image pickup apparatus comprising:

• an image pickup optical system which comprises, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power and an optical path bending reflecting surface having a variable shape disposed on the image side of a most image side lens component of said second lens unit, and is configured to change a magnification by moving said second lens unit along an optical axis, wherein said image pickup apparatus is configured to control the optical path bending reflecting surface having the variable shape taking into consideration data of a paraxial amount or curvature of field in said image pickup optical system.