18978869. OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, AND LENS APPARATUS (CANON KABUSHIKI KAISHA)
OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, AND LENS APPARATUS
Organization Name
Inventor(s)
Toyokatsu Fujisaki of Tochigi JP
OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, AND LENS APPARATUS
This abstract first appeared for US patent application 18978869 titled 'OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, AND LENS APPARATUS
Original Abstract Submitted
An optical system includes, 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 positive refractive power, and a third lens unit having a positive refractive power. During focusing from infinity to a short distance, the first lens unit is fixed, and the second lens unit and the third lens unit are moved so that a distance between the second lens unit and the third lens unit changes. Predetermined conditions are satisfied.