Tag: Canon RF 28-70mm f/2.8L Lens

A new Canon patent that is describing 28-70mm f/2.8 lens surfaced online. Designed for Canon RF-mount full-frame mirrorless cameras it seems to be a patent on the optical system of the large-aperture zoom lens “28-70mm F2.8” that are likely to adopt a retractable structure.

[Publication number] P2022147945
[Publication date] October 6, 2022
[Patent application title] Zoom lens and imaging device

From the patent literature:

A zoom lens is provided which is compact and lightweight and capable of achieving high optical performance over the entire zoom range and all object distances.

More details of the new Canon Patents for full-frame mirrorless cameras can be found below.

Continue reading “New Patent for Canon RF 28-70mm f/2.8 Lens”

New Canon Patent applications filed for a set of RF mount lenses. These new lenses are the Canon RF 28-70mm f/2.8 & 28-60mm f/2.8.

Canon patent application 2022091621 (Japan) discusses optical formulas for two small and compact zoom lenses with large aperture:

• 28-70mm f/2.8
• 28-60mm f/2.8

Example 1

• Focal length: 28.84-67.90
• F value: 2.91
• Half angle of view: 32.68-17.67
• Image height: 18.50-21.64
• Overall length: 138.40-105.42
• Back focus: 10.97-21.12

Example 2

• Focal length: 28.84-60
• F value: 2.91
• Half angle of view: 32.68-19.83
• Image height: 18.50-21.64
• Overall length: 132.38-106.85
• Back focus: 13.47-23.82