Canon Patents EF & EF-M 50-300mm f/4.5-5.6 DO STM

According to the Egami Blog, Canon has patented an EF 50-300mm f/4.5-5.6 STM with diffractive optics and a similar EF-M version.
 
Description of Patent
 
  • Patent Publication No. 2016-57444
  • Published 2016.4.21
  • Filing date 2014.9.9
  • EF Version
    • 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
  • EF-M Version
    • 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
Posted: 4/22/2016 12:08:31 PM CT   Posted By: Sean
Posted to: Canon News
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