Patent ID: 7463426

Claim:
An image pickup apparatus comprising: an image pickup element; and an optical system configured to form an image on the image pickup element, the optical system comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power and including a reflecting member configured to deflect an optical axis; and a rear lens unit having a positive refractive power and including at least one lens unit having a positive refractive power, wherein the second lens unit is stationary for zooming, wherein, during zooming, the image pickup element moves, and an interval between the first lens unit and the second lens unit and an interval between the second lens unit and the rear lens unit vary, and wherein a composite focal length (FFw) of the first lens unit and the second lens unit at a wide-angle end, a focal length (FRw) of the rear lens unit at the wide-angle end, and a focal length (Fw) of the optical system at the wide-angle end satisfy the following conditions: 0.3 <|Fw/FFw|< 0.6, and 0.2 <Fw/FRw< 0.6.