Canon Patents APS-C Format DO Lens Technology.

Canon Patents APS-C Format DO Lens Technology.

We have seen Canon utilise ‘DO’ or ‘Diffractive Optical’ technology in In full-frame lenses, but this new patent marks the company’s first foray into DO lens technology specifically designed to be used with ASP-C sized sensors. DO technology works by placing multiple grooved Diffractive Optical elements within a lens, which work together to diffract incoming light in a pattern that eliminates nearly all chromatic abberation. The use of DO elements within a lens also allows lens elements to placed much closer together than would otherwise be possible, therefore allowing for much shorter lens barrel designs. Canon has thus far employed this technology successfully in Super-telephoto and Telephoto zoom lenses, creating much more portable equivalents to lenses that would otherwise be large and reasonably cumbersome. Some shooters report a slight loss of sharpness with DO lenses compared with their regular counterparts and they are not yet available at apertures faster than f/4.0, but overall reviews are very positive. Their compact size also lends itself to the compact nature of ASP-C sized cameras in general. Check out the patent details below:

  • 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

You can check out Canon’s current range of DO lenses at the following Links:

Source: thenewcamera.

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