Canon Patent: 11-24mm f/4 IS, 12-24mm f/2.8 IS, And Already Released RF 14-35mm f/4L IS

A new week, a new Canon patent application. More lenses for the RF mount and one already released lens.

Canon patent application 2020-199535 (Japan) seems to describe the optical formula for the already released RF 14-35mm f/4L IS, and for two more wide angle zoom lenses for the RF mount: 11-24mm f/4 IS and 12-24mm f/2.8 IS.

PROBLEM TO BE SOLVED: To provide a zoom lens capable of achieving both wide angle of view and miniaturization, and further maintaining high optical performance even at the time of vibration isolation.

Example 1

• Focal length: 11.33-23.30
• F value: 4.08
• Half angle of view: 59.63-42.88
• Image height: 19.33-21.64
• Overall length: 135.40-130.90
• Back focus: 13.63-14.26

Example 2

• Focal length: 12.36-23.30
• F value: 2.91
• Half angle of view: 57.41-42.88
• Image height: 19.33-21.64
• Overall length: 130.51-119.64
• Back focus: 13.43-24.55

Example 3

• Focal length: 14.42-33.95
• F value: 4.08-4.12
• Half angle of view: 53.26-32.50
• Image height: 19.33-21.64
• Overall length: 125.87
• Back focus: 14.99

Example 4

• Focal length: 15.45-33.95
• F value: 2.91
• Half angle of view: 51.37-32.51
• Image height: 19.33-21.64
• Overall length: 149.62-135.96
• Back focus: 15.11

More Canon patent applications are listed here. 

[via asobinet]