Canon Patent: 15mm F4.5 And 10mm F3.5 For APS-C Mirrorless

And here is one more Canon patent. Canon patent application 2024006604 (Japan, published 01/17/2024) discusses optical formulas for two wide prime lenses for mirrorless cameras with an APS-C imaging sensor.

• 15mm F4.5
• 10mm F3.5

From the patent literature:

• An object of the present invention is to provide an optical system that can reduce the occurrence of ghosts while having high optical performance.
• BACKGROUND ART: Wide-angle lenses are widely used for landscape photography, astronomical photography, and the like. Wide-angle lenses are required to have a wide angle of view and high optical performance.
• Patent Document 1 discloses an optical system that has a wide angle of view and improved optical performance by employing a plurality of negative lenses on the object side to gently bend off-axis rays. ing.

Example 1

• Focal length: 15.45
• F value: 4.60
• Half angle of view: 49.36
• Image height: 18.00
• Total length: 115.26
• Back focus: 13.50

Example 2

• Focal length: 9.97
• F value: 3.50
• Half angle of view: 49.63
• Image height: 11.72
• Total length: 72.73
• Back focus: 10.06

Example 3

• Focal length: 16.00
• F value: 4.60
• Half angle of view: 48.58
• Image height: 18.14
• Total length: 99.94
• Back focus: 13.04

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[via asobinet]