内蔵エクステンダーの操作部が回転するキヤノンの特許出願

Yesterday, I picked up on a patent application that seemed to envision the 400mm F4 DO IS Extender 1.4× and 600mm F4 IS Extender 1.4×, and now a patent application for the structure of the built-in extender has been published. This time, a patent application for the structure of the built-in extender has been published. The fact that the structure of the optical system and the moving parts have appeared in a series of patents suggests that they are seriously considering a telephoto single focal length lens with a built-in extender.
This patent application is not just about the movable parts of the built-in extender, but it also aims to make the movable parts rotatable to provide operability suitable for various shooting styles.

For example, the current lens with built-in extender, the EF200-400mm F4L IS USM Extender 1.4×, has the extender switching lever positioned for left hand operation, so it is not compatible with right hand operation. In fact, some people have commented that they wished it was placed in a position where it could be used for right-handed operation like Nikon's, so there may be demand for improved operability.
I am wondering if this structure can be implemented in the telephoto L-series, which requires robustness, but it seems highly likely that research and development is underway for lenses with built-in extenders. We may see more patent applications like this in the future.

Incidentally, a drop-in filter rotation structure with a similar concept is shown in Example 2.