Canon Patent for EF 28-200mm f/3.5-5.6 STM Lens

Canon filed a new patent in Japan. The new patent describes the EF 28-200mm f/3.5-5.6 STM lens which looks like to be a new zoom lens for full-frame sensor Canon DSLRs.

From the paent application we can say the upcoming full-frame EF 28-200mm f/3.5-5.6 STM lens will feature STM motor for silent and fast AF operation.

The lens looks like a budget superzoom lens for Canon full-frame DSLRs. See the patent details below.

Canon EF 28-200mm f/3.5-5.6 STM Lens Patent

• Patent Publication No. 2015-172612
  • Published 2015.10.1
  • Filing date 2014.3.11
• Example 1
  • 1
  • Zoom ratio 6.68
  • Focal length 28.90 51.17 193.10
  • F-number 3.63 4.39 5.88
  • Half angle (in degrees) 36.82 22.92 6.39
  • Image height 21.64 21.64 21.64
  • Overall length of the lens 132.70 149.90 182.70
  • BF 39.40 49.73 66.13,

via Egami