In this patent application (2024-149828) we have Canon doing some great things with extenders built into both a regular lens and a diffractive optics lens.

Canon Patent Applicaton: Canon RF 400mm F4L DO IS with 1.4x Extender
In this patent application (2024-149828) we have Canon doing some great things with extenders built into both a regular lens and a diffractive optics lens.
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