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]