New Patents: Canon 300mm 2.8 and 400mm 2.8 DO Lens

Canon Lens patent

Canon has just filed two new patents for super telephoto lenses. One is Canon 300mm F2.8 DO and the other is 400mm F2.8 DO.

See the details below:

Japan Patent Application 2018-189878

 

  • Focal distance      392.58
  • F number              2.91
  • a half field angle    3.15
  • Image height         21.64
  • length of the lens  363.53
  • BF                   59.15

 

  • Focal distance      293.40
  • F number              2.91
  • a half field angle    4.22
  • Image height         21.64
  • length of the lens  274.00
  • BF                   59.35

Read More Canon Lens Patent

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