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Canon patent for 50-300mm F4.5-5.6 Diffractive Optics lens for APS-C sensors

Canon patent

Canon patent for a 50-300mm F4.5-5.6 lens with diffractive optical elements. The optic formula described in the patent appears to refer to APS-C sensor (not full-frame). Hence, the lens may come either for EF-S or EF-M mount. I guess this would be the first APC-S oriented lens with diffractive optics (anyone?).

  • Patent Publication No. 2016-57444
    • Published 2016.4.21
    • Filing date 2014.9.9
  • Example 1
    • Zoom ratio 5.59
    • Focal length 51.77 135.00 289.53
    • F-number 4.65 5.05 5.85
    • Half angle of view (degrees) 14.78 5.78 2.70
    • Image height 13.66 13.66 13.66
    • The total lens length 126.05 169.37 184.15
    • BF 35.50 35.50 35.50
  • Example 2
    • Zoom ratio 5.90
    • Focal length 49.13 135.00 290.00
    • F-number 4.65 4.95 5.85
    • Half angle of view (degrees) 15.54 5.78 2.70
    • Image height 13.66 13.66 13.66
    • The total lens length 108.00 152.12 168.00
    • BF 15.69 15.69 15.69
[via Egami]
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