Patent: Canon RF 80-240mm f/3.5 Lens

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Here is another Canon patent application for the RF 80-240mm f/3.5 zoom lens.

Canon patent application No. 2022-29115 (Japan) discusses optical formulas for a Canon RF 80-240mm f/3.5 zoom lens.

Overview

  • [Publication Number] Japanese Patent Application Laid-Open No. 2022-29115
  • PROBLEM TO BE SOLVED: To provide a zoom lens, an image pickup device having the same, and an image pickup system.
  • [Applicant]
    [Identification number] 000001007
    [Name or name] Canon Inc.
  • PROBLEM TO BE SOLVED: To provide a compact and lightweight zoom lens having high optical performance in the entire zoom and the entire focus range, and an image pickup device and an image pickup system having the same.
  • [0002]
    In recent years, the image pickup device has been miniaturized, and the image pickup device used in the image pickup device has a high pixel count. Further, the optical system used in the image pickup apparatus is required to have high optical performance, and to be compact and lightweight. In order to satisfy these requirements, a zoom with positive, negative, positive, positive, and negative refractive power first to fifth lens groups arranged in order from the object side to the image side to reduce various aberrations. A lens has been proposed (see Patent Document 1).
  • [0004]
    In order to reduce the size of the zoom lens, it is effective to adopt a telephoto type power arrangement and increase the positive refractive power on the object side and the negative refractive power on the image side. However, if the refractive power of each lens group is increased, the fluctuations of various aberrations due to zooming and focusing become large, and it becomes difficult to satisfactorily correct the various aberrations with a limited number of lenses. Therefore, in order to achieve both the optical performance of the zoom lens and the miniaturization, it is important to appropriately set the refractive power of each lens group, the lens configuration, and the position of the focus group.
  • [0005]
    An object of the present invention is to provide a compact and lightweight zoom lens having high optical performance in the entire zoom and the entire focus range, and an image pickup apparatus and an image pickup system having the same.

Example 1

  • Focal length: 72.00-194.00
  • F value: 2.92
  • Half angle of view: 16.72-6.36
  • Image height: 21.64
  • Overall length: 185.00-255.23
  • Back focus: 16.68-70.96

Example 2

  • Focal length: 72.00-194.00
  • F value: 3.5
  • Half angle of view: 16.72-6.36
  • Image height: 21.64
  • Overall length: 185.00-255.16
  • Back focus: 15.63-65.11

Example 3

  • Focal length: 80.29-232.85
  • F value: 3.5
  • Half angle of view: 15.08-5.31
  • Image height: 21.64
  • Overall length: 222.75-325.37
  • Back focus: 11.49-64.12

Canon RF Lens List:

RF Zoom Lens
RF Prime Lens

Read more:

Via: asobinet