I recall back to the film days and using the glorious little 55 and 56mm primes. Hardly anyone makes them anymore which I think is a sad state of affairs. Needless to say, this patent application got me a bit intrigued for that very reason. While Canon certainly made 55mm back in the FD days, they haven’t made an EF (or RF) lens of that focal length.
Canon’s embodiments in this patent application are 56mm F1.2 primes based upon the double Gauss element arrangement. The back focus distance is what Canon is attempting to lower with this patent application and it’s around 30mm for the embodiments which is certainly suitable for an RF-mounted lens. The lens itself would be fairly compact, being around 60mm in length.
Canon RF 56mm F1.2
Focus Distance 56.00
F number 1.24
Half angle of view (°) 21.12
Image height 21.64
Lens total length 79.92
As with all of Canon’s patent applications, this patent application may not become an actual product or even a patent. What it does is give us a clue to what Canon has been researching.
Source: Japan Patent Office: 2023-127280
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