New Patent for Canon 24-300mm f/3.5 – 5.6 Tells Us…What?

by Hugh Brownstone2 Comments

Shout-out to for the heads-up. The questions arising from the latest news about the Canon zoom lens line are at least as interesting as the patent itself.

Canon makes great glass. Their telephoto primes are among the best (maybe THE best) ever produced, and a recent teardown of Canon’s 35mm f/1.4 Mark II by the guys at shows just how much Canon can put into a lens when it chooses to do so.

With a variable aperture and such a wide focal range, however, one can argue that this is likely to be a consumer grade lens – I’d expect to see a constant aperture in an L series lens, and no L series lens has ever come close to the 12x range of this one.

On the other hand, wouldn’t it be something if Canon decided to show what it can really do in a video-centric zoom aimed at enthusiasts and prosumers? I’d love to see a response to Sony’s FE PZ 28-135 f/4 G OSS, one of my new favorites and a 2015 Gear of the Year pick.

PATENT: CANON EF 24-300MM F/3.5-5.6

CANON EF 24-300MM patent

Via Canon Rumors:

Another patent for a full frame superzoom has appeared from Canon. We’ve written about the development of such a lens a few times since May of 2015, most recently this past November, and we continue to see more patents for such a lens.

Patent Publication No. 2015-215438 (Machine Translated)

  • Published 2015.12.3
  • Filing date 2014.5.9
  • Focal length 24.70 101.33 292.01
  • Fno 3.50 4.59 5.87
  • ω (degrees) 41.22 12.05 4.24
  • Image height 21.64 21.64 21.64
  • Overall length of the lens 202.71 232.50 288.71
  • BF 38.78 43.69 75.66

Read full article at Canon Rumors “PATENT: CANON EF 24-300MM F/3.5-5.6”

(cover photo credit: snap from Canon Rumors)

Hugh Brownstone

Hugh is the founder of Three Blind Men and An Elephant Productions. He and the team write, direct, shoot, score, and edit web-centric films; conduct photo shoots; and write copy, white papers and blog posts. Hugh also writes screenplays (he recently optioned a TV pilot) and just published his first eBook (Apple's iPhone: The Next Video Revolution). If it's about telling stories, it's in their wheelhouse.

And always with the ambition of authenticity, humanity and wit.
Hugh Brownstone


  1. “I’d expect to see a constant aperture in an L series lens, and no L series lens has ever come close to the 12x range of this one.”

    Except maybe the EF 28-300 f/3.5-5.6L IS

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