Sony 150-400mm f/4 and 70-200mm f/2.8 Patents
Overview
- [Publication number] P2023039817
- [Release date] 2023-03-22
- [Title of Invention] Zoom lens and imaging device
- [Application date] 2021-09-09
- [Applicant]
[Identification number] 000002185
[Name] Sony Group Corporation - An object of the present invention is to make it possible to satisfactorily correct various aberrations while being lightweight.
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2. Description of the Related Art
A photographing optical system used in an image pickup apparatus (camera) is required to have various focal lengths and apertures depending on the application. For example, telephoto zoom lenses capable of zooming in on a distant subject at a desired angle of view are required to have high image quality, be compact and lightweight, have a high zoom ratio, and be capable of rapid focusing. As a zoom lens that satisfies these requirements, a positive lead type zoom lens in which a lens group having a positive refractive power is arranged closest to the object side is known. - [0004]
In order to improve the image quality of telephoto zoom lenses, it is important to correct various aberrations due to zooming, such as axial chromatic aberration, chromatic aberration of magnification, spherical aberration, and curvature of field. will increase. In the zoom lenses described in Patent Documents 1 and 2, the refractive power of the positive lens group that moves during zooming is very strong, which increases the lens weight and the number of lenses, and is not optimal as a lightweight zoom lens configuration. . - [0005]
It is desirable to provide a zoom lens and an imaging apparatus that are lightweight and capable of satisfactorily correcting various aberrations.
Example 1
- Focal length: 154.53-387.86
- F-value: 4.12
- Angle of view: 15.94-6.39
- Image height: 21.64
- Total length: 339.98
Example 2
- Focal Length: 72.14-193.95
- F-value: 2.88
- Angle of view: 33.40-12.73
- Image height: 21.64
- Overall length: 215.07
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