Canon APS-C RF Zoom Lenses Patent Spotted

Canon’s two new compact zoom lens patents were spotted today [Aug 29 2022], right now we have only one all-rounder lens the 18-150mm from Canon. Other than that we don’t have any dedicated entry-level Zoom Lens for RF-S APS-C Mount Mirrorless cameras.

The two lenses are

• RF-S55-200mm F4-7.1
• RF-S55-250mm F5.6-8

Undoubtedly Canon will finally approve the  RF-S 55-250mm F5.6-8 Lens. Let’s take a look at the patent details

Patent Details

• [Publication number] P2022125480
• [Release date] 2022-08-29
• [Title of Invention] A zoom lens and an imaging device having the same
• [Application date] 2021-02-17
• [Applicant]
  [Identification number] 000001007
  [Name] Canon Inc.
• A zoom lens that has high optical performance over the entire zoom range and is capable of ensuring a sufficient zoom ratio while reducing weight, and an imaging device having the zoom lens.
• [0004]
  In order to secure a sufficient zoom ratio in a zoom lens, it is necessary to increase the amount of change in lateral magnification per unit amount of movement of each lens group during zooming from the wide-angle end to the telephoto end. For that purpose, it is necessary to strengthen the refractive power of each lens group, and to correct various aberrations that occur at that time, it is necessary to increase the number of lenses. However, increasing the number of lenses in each lens group will increase the size of the zoom lens. In order to ensure a sufficient zoom ratio and reduce weight, it is important to increase the amount of movement of each lens group during zooming. SUMMARY OF THE INVENTION
  It is an object of the present invention to provide a zoom lens that has high optical performance over the entire zoom range and that is capable of ensuring a sufficient zoom ratio while reducing weight, and an imaging apparatus having the zoom lens.
• SUMMARY OF THE INVENTION
  It is an object of the present invention to provide a zoom lens that has high optical performance over the entire zoom range and that is capable of ensuring a sufficient zoom ratio while reducing weight, and an imaging apparatus having the zoom lens.

Example 1

• Focal length: 56.65-194.00
• F-value: 5.00-7.10
• Half angle of view: 13.56-4.03
• Image height: 13.66
• Overall length: 105.29-156.70
• Back focus: 20.49-57.43

Example 2

• Focal Length: 56.65-249.98
• F-value: 5.59-8.00
• Half angle of view: 13.56-3.13
• Image height: 13.66
• Overall length: 120.22-175.57
• Back focus: 23.43-75.75

Example 3

• Focal length: 56.65-194.00
• F-value: 4.29-6.30
• Half angle of view: 13.56-6.86
• Image height: 13.66
• Total length: 105.07-146.47
• Back focus: 24.12-61.37

See More Canon Patents

See more

• Should You Buy Canon 90D in 2022
• Should you buy a Canon M50 Mark II camera in 2022?
• Canon 6D Beats Flagship Mirrorless Cameras in DR Test
• Canon Patent – Working on a New Adapter

source – asobinet.com