Telephoto Lens and Image Pickup Apparatus Using the Same
AssigneeOlympus Corporation
InventorsYasuji Ogata, Akiko Naito, Kento Hara
Life of this patent
Estimating the term…
Abstract
A telephoto lens includes in order from an object side, a first unit having a positive refractive power, a second unit having a negative refractive power, and a third unit having a positive refractive power, and a focusing from an infinite object point to an object point at a short distance is carried out by moving the second unit toward an image side, and the following conditional expression (17) is satisfied: 0.2<Y2/Y1a<0.32 (17) where, Y2 denotes a maximum height of an axial light ray on a surface of incidence of the second lens unit, and Y1a denotes a maximum height of an axial light ray on a surface of incidence of the first lens unit.
Claims24
A telephoto lens comprising in order from an object side:
- a first unit having a positive refractive power;
- a second unit having a negative refractive power;
- and
- a third unit having a positive refractive power, wherein
- a focusing from an infinite object point to an object point at a short distance is carried out by moving the second unit toward an image side, and
- the following conditional expression (17) is satisfied:
- 0.2<Y2/Y1a<0.32 (17),
- where,
- Y2 denotes a maximum height of an axial light ray on a surface of incidence of the second unit, and
- Y1a denotes a maximum height of an axial light ray on a surface of incidence of the first unit.
A telephoto lens 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
- a rear lens unit having a positive refractive power, wherein
- the rear lens unit includes a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, and
- the fifth lens includes in order from the object side to the image side, an object-side cemented lens and an image-side cemented lens.
Dependencies are inferred from the claim text.