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

Canon Patent

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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