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Canon patent for EF 600mm f/4 IS DO lens


That may become a killer lens if it ever goes to production. Canon files a patent for a n EF 600mm f/4 IS DO lens. “DO” stays for diffractive optics.

Will this lens eventually replace the existing EF 600mm f/4L IS II? Not necessarily. DO optics are usually of smaller size than their counterparts without DO, so the lens referred in the patent could well be an addition to the line-up.

  • Patent publication number 2016-200685
    • Release date 2016.12.1
    • Application date 2015.4.9
  • Example 1
    • Focal length 585.00
    • F number 4.12
    • Half angle of view (degree) 2.12
    • Image height 21.64
    • Lens total length 335.32
    • BF 66.92
[via Egami]
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