Canon patent of 24-70mm F2.8

Canon applied for a patent about 24-70/2.8 lens. A lens on behalf of Company Canon will be finally changed the model of.

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Canon EF24-70mm F2.8L II USM

patent:24-70mm F2.8

Canon EF24-70mm F2.8L USM

existing article:EF24-70mm F2.8L USM(2002)

  • Patent Publication No.2010-243636
    • published 2010/10/28
    • filled 2009/04/02
  • Embodiment1
    • focal distance 24.54-66.07mm
    • Fno=2.91-2.92
    • angle of view 82.8-36.26°
    • image circle 43.28mm
    • length 204.97-170.32mm
    • back focus 37.06mm

This is a new hig-speed standard zoom lens of Canon. What you should be surprised at is the performance. a MTF graph is described in the patent document. A fall of the contrast is not seen in this optical system at the outskirts. The left graph was Canon 24-70/2.8-3.3, but it was not released.

very good contrast

However, the optical system is considerably complicated. A lens behind is fixed, but the other lenses move by focusing and zooming. The Cam will become the considerably elaborate mechanism. The body tube must upsize.


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