佳能公布EF 400mm f/2.8L IS镜头专利 内置两款增距镜

      近日,佳能在日本公布了一款EF 400mm f/2.8L IS规格的长焦定焦镜头专利。新镜头内置了两种增距镜,包括一个1.4X增距镜和一个1.7X增距镜,使得用户能够在一只定焦镜头中获得400mm、560mm及680mm三个焦段。

佳能EF 400mm f/2.8L IS

      Patent Publication No. 2016-191761 

  • Published 2016.11.10
  • Filing date 2015.3.31
  • Focal length 392.57
  • F-number 2.90
  • Angle of view 3.15
  • Image height 21.64
  • Overall length of the lens 371.15
  • BF 44.00
  • The first state magnification 1.40
  • The second state magnification 1.70
S.T.X Photography

S.T.X Photography

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