Canon First APS-C DO Lens Patent Spotted

The Canon DO lens technology helps to create smaller and compact lenses and we already have fullframe DO Lenses for EF Mount camera. But for the first time we came to know that Canon is working on a EF-M and EF-S mount DO lenses.

Both the lenses shares approx same core specification, The lens focal length  50-300mm, aperture range F4.5-6 DO and features STM (stepping motor for silent AF operation). However, both the lenses are missing Image stabilization and it will be bit hard to capture handheld shots at 300mm.

Description, self-interpretation of the patent literature

• Patent Publication No. 2016-57444
  • Published 2016.4.21
  • Filing date 2014.9.9
• Example 1
  • Zoom ratio 5.59
  • Focal length 51.77 135.00 289.53
  • F-number 4.65 5.05 5.85
  • Half angle of view (degrees) 14.78 5.78 2.70
  • Image height 13.66 13.66 13.66
  • The total lens length 126.05 169.37 184.15
  • BF 35.50 35.50 35.50
• Example 2
  • Zoom ratio 5.90
  • Focal length 49.13 135.00 290.00
  • F-number 4.65 4.95 5.85
  • Half angle of view (degrees) 15.54 5.78 2.70
  • Image height 13.66 13.66 13.66
  • The total lens length 108.00 152.12 168.00
  • BF 15.69 15.69 15.69

See more Canon Lens Patent

source egami