Fascinating patent could point toward more versatile fast prime lenses.
However, while those lenses with built-in teleconverters are very long telephoto lenses, Canon’s patent application is notable in that it shows diagrams of a much smaller, shorter lens.that Canon’s diagram shows what looks like a 50mm f/1.2-style prime lens and speculates that perhaps the patent could apply to a “possible 50mm and 85mm hybrid lens using a built-in teleconverter, so consider as an example a 50mm f/1.2 and an 85mm f/2.
A teleconverter is one means for changing the focal length of a compatible lens, but attaching and detaching the teleconverter each time someone wants to change framing is tedious and no faster than just swapping in a new prime lens. An internal teleconverter would undoubtedly make the process much faster. Such an internal teleconverter design could also enable a quasi-zoom lens with fast apertures, similar in spirit to something like the Tamron 35-150mm f/2-2.
In the case of Nikon’s TC-equipped lenses, a large, noticeable hump is created by the space required to put the teleconverter optical group when it is not in use. Canon’s patent poses an alternative to this design and promises a smooth barrel. Fitting these movable optics inside a lens without creating a large barrel requires an exact and clever optical design. As is always the case with patent applications, the described technology may never be implemented in an actual product. Nonetheless, it is a fascinating idea and one of the strangest patents seen recently.
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