Canon Patent: 24mm F1.4, 35mm F1.4 And 50mm F1.4

And yet another Canon patent application. Fast primes for the RF mount.

Canon patent application 2022024113 (japan, published 8/30/2023) discusses optical formulas for three fast prime lenses:

• 24mm F1.4
• 35mm F1.4
• 50mm F1.4

From the patent literature:

Optical system and imaging device

A compact optical system capable of high-speed focusing with a wide angle of view and a large aperture ratio is provided.

Description of the Related Art

Imaging devices using solid-state imaging devices such as CCD sensors and CMOS sensors are required to have optical systems that have a wide angle of view, a large aperture ratio, a small size, and high optical performance. There is also a demand for high-speed autofocus in the optical system.

An optical system with a wide angle of view and a large aperture ratio has the problem that it is difficult to correct various aberrations. In particular, if the weight of the focus lens group is reduced in order to perform high-speed focusing (autofocus), it becomes difficult to suppress aberration fluctuations in focusing from an object at infinity to a close object.

According to the present invention, it is possible to provide a compact optical system capable of high-speed focusing while having a wide angle of view and a large aperture ratio.

Example 1 (24mm F1.4)

• Focal length 24.36
• F value 1.44
• Half angle of view 41.61
• Image height 21.64
• Lens length 106.56
• Back focus 12.72

Example 2 (35mm F1.4)

• Focal length 34.09
• F value 1.45
• Half angle of view 32.40
• Image height 21.64
• Lens length 113.84
• Back focus 13.67

Example 3 (50mm F1.4)

• Focal length 48.50
• F value 1.45
• Half angle of view 24.04
• Image height 21.64
• Lens length 108.70
• Back focus 11.47

More Canon patents are listed here.

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