skip to Main Content

Canon patent: 300mm F2.8 IS ASPH lens

300mm F2.8 IS ASPH

Canon filed a patent for a 300mm F2.8 IS ASPH lens.

According to the present invention, at the telephoto lens, a cemented lens and a non-spherical surface consisting of a glass material having an anomalous dispersion characteristic that used in the appropriate refractive power where appropriate, in the chromatic aberration of the correction and the entire optical system it is possible to achieve both of the reduction in size and weight to provide an optical system that has been made.

  • Patent Publication No. 2016-173439
    • Published 2016.9.29
    • Filing date 2015.3.17
  • Example
    • Focal length 292.46
    • F-number 2.91
    • Angle of view 4.23
    • Image height 21.64
    • Overall length of the lens 273.95
    • BF 60.81
[via Egami]


Back To Top


This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy.
By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to the use of cookies.