Canon Patent Application: Canon RF 17-70mm F4-5.6 BR
/ Categories: Canon Patents

Canon Patent Application: Canon RF 17-70mm F4-5.6 BR

We first discovered Canon desigining a 17-70mm Full frame lens a while ago, and here is another patent application discussing such a lens.

however, this lens has a twist, as it contains a BR element (a rather large one as the element closest to the sensor is the BR element).

It isn't all good though, the lens requires image stretching basically most of the way from 17mm to at least 28mm, even though it's only slight at 28mm.   The inclusion of the BR element allows Canon some additional freedom to make this lens quite small, at a size of 80mm at its shortest length.

A lens like this could be the "bridge" lens that Canon is thinking about when coming out with an APS-C camera body.  This would be an okay lens on a crop camera (still bigger than your normal kit lenses though) and an excellent walkaround lens on a full-frame camera.

Canon RF 17-70mm F4-5.6 BR

Focal length          17.50  28.00  58.00
F value                4.10   4.50   5.70
angle of view (°)     51.50  38.16  20.77
Maximum image height  22.00  22.00  22.00
Real image height     19.47  20.98  21.94
Total length         108.50 114.27 158.50
BF                    21.38  33.45  49.01

Japan Patent Application 2021-182053

blog comments powered by Disqus

Our Sponsers

Free Shipping to the USA and Canada*

Use CANONNEWS for $10 off AuroraHDR

Use CANONNEWS for $10 off Luminar

*Conditions may apply

Latest Rumors

  • All
  • Canon DSLR
  • Canon Mirrorless
  • Canon Powershot
  • Canon CINI Products
  • Canon Lenses
  • Canon Accessories
  • Third Party
    Previous Next

    Our Reviews

    Third Party Reviews

    Most popular

    No content

    A problem occurred while loading content.

    Previous Next

    Industry News

    Terms Of UsePrivacy Statement© 2022 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
    Back To Top