EF 300mm f/4L IS USM

Optics Patent

Former Nikon (Changes to R5 upon delivery)
Nov 6, 2019
310
248
Canon introduced their technology before Nikon so there was no need for their marketing people to avoid the use of Fresnel.
There are other reasons why they might avoid the term. Not that it bothers me, but it might be associated with cheap plastic gimmicks.

Nonetheless, the physical evidence shows no other explanation than that this is in fact a fresnel and not really diffraction optics.

I think the tech is great by the way.
 

Mt Spokane Photography

I post too Much on Here!!
Mar 25, 2011
15,710
880
Its a good thing to have a high quality L lens selling for a reasonable price. A new design would likely cost $2200 or more.