In one of their latest patents, they show off 21 optical designs to show what is possible using 3-group lens design. The ProblemAutofocus speed is highly dependent on how heavy a lens group is to move. Canon is spending a lot of time shrinking the number and size of elements in lens design as well as reducing the number of moving parts. This 3-group lens design is intended for everything from EOS R cameras, camcorders, security and broadcast cameras. Closing ThoughtsThis patent is more about a broad formula for lens design and not a specific lens design.