Canon Patent: RF 20-60mm f/4.5-6.3 Lens For EOS R System

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And here we have another Canon patent application published today.

Canon patent application 2023099391 (Japan, published 7/13/2023) discusses optical formulas and methods for an RF 20-60mm f/4.5-6.3 lens for the EOS R system. Is this a possible new kit lens?

From the patent literature:

A zoom lens and an imaging device having the same

A compact, lightweight zoom lens with high optical performance and an imaging device and an imaging system having the zoom lens are provided.

Description of the Related Art

A zoom lens used in an imaging apparatus is required to have a wide angle of view, a small size, and a light weight. As a wide-angle zoom lens, a so-called negative lead type zoom lens is known, in which a lens group having a negative refractive power is arranged closest to the object side.
However, in the zoom lens disclosed in Patent Document 1, although the size and weight of the zoom lens have been reduced, various aberrations have not been satisfactorily corrected, resulting in insufficient optical performance. [0007]The present invention provides a zoom lens that is compact and lightweight and has high optical performance, and an imaging apparatus and an imaging system having the zoom lens.

Example 1

  • Focal Length: 24.71-48.53
  • F-value: 4.63-6.48
  • Half angle of view: 36.23-2308
  • Image height: 18.10-20.68
  • Overall length: 105.60-99.03
  • Back focus: 16.94-37.19

Example 2

  • Focal Length: 20.91-48.50
  • F-value: 4.63-6.49
  • Half angle of view: 41.17-23.03
  • Image height: 18.02-20.61
  • Total length: 120.00-100.66
  • Back focus: 10.49-31.34

Example 3

  • Focal Length: 20.61-58.50
  • F-value: 4.64-6.49
  • Half angle of view: 41.17-19.41
  • Image height: 18.02-20.61
  • Overall length: 135.00-125.50
  • Back focus: 10.49-11.70

More Canon patents are listed here.

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Canon Patent: 18-55mm F4-6.5 & 20-60mm F4-6.5 For Full Frame Mirrorless

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Two Canon patents today, this one and the one featured here.

Canon patent application 2023010106 (Japan, published 1/20/2023) discusses optical formulas for what seem to be two possible kit lenses, both for full frame mirrorless cameras, i.e. the RF mount:

  • 18-55mm f4-6.5
  • 20-50mm f4-5.6

From the patent literature:

A compact zoom lens that achieves high optical performance while widening the angle of view is provided.

In recent years, there has been a strong demand for a lens system used in an imaging apparatus to have high optical performance while the entire lens system is compact. In order to achieve good optical performance while miniaturizing the entire lens system, it is important to appropriately set the refractive power of each lens group, the moving conditions for zooming, and the like of each lens group. In particular, in a camera with a large image pickup element, when a desired magnification is secured while widening the angle, the front lens tends to become large, and it is necessary to appropriately configure each lens group.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a compact zoom lens that achieves high optical performance while widening the angle of view.

Example 1

  • Focal length: 18.50-53.01
  • F-value: 4.11-6.48
  • Half angle of view: 49.17-22.02
  • Image height: 18.50-21.64
  • Overall length: 117.88-150.43
  • Back focus: 19.52-24.90

Example 2

  • Focal length: 19.72-53.16
  • F-value: 4.12-6.07
  • Half angle of view: 48.13-22.43
  • Image height: 18.50-21.64
  • Total length: 126.89-162.14
  • Back focus: 21.40-51.52

Example 3

  • Focal Length: 18.50-58.92
  • F-value: 4.12-6.48
  • Half angle of view: 49.09-19.95
  • Image height: 18.50-21.64
  • Total length: 132.01-160.73
  • Back focus: 24.47-37.26

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

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