In this patent application, Japan Patent Application 2023-120952 Canon discusses developing lenses for video, surveillance, and stills photography that have very quick autofocus.
The method they use for this is reducing the weight of the focus group to allow for quicker focus.
There are a few embodiments that look cool – but the back-focus distance between the last element and the sensor is tight for the RF mount. The distance between the flange and the sensor on the RF mount is 20mm, and these lenses would sit inside the mount up to 8mm. However, it should be noted that Canon has mirrorless lenses that have sat quite deep into the mount. I'm not sure what the deepest lens is on the RF mount, but on the EOS-M the EF-M 11-22mm ingressed into the mount around 8mm, and that flange to sensor distance was 2mm shorter than the RF mount. So while it's unlikely, there is a chance that Canon is certainly thinking of slapping these bad boys onto the RF mount and calling it a day. We wouldn't mind, would we?
Canon RF 24mm F1.4
Focal length 24.36 F number 1.44 Half angle of view (°) 41.61 Image height 21.64 Lens total length 106.56 SK 12.72
Canon RF 35mm F1.4
Focal length 34.09 F number 1.45 Half angle of view (°) 32.40 image height 21.64 total lens length 113.84 sk 13.67
Canon RF 50mm F1.4
Focal length 48.50 F number 1.45 Half angle of view (°) 24.04 Image height 21.64 Lens total length 108.70 Back Focus 11.47
This would make a very nice set of primes, perhaps not the smallest primes as each lens is around 80mm in length but for F1.4 no one would complain. High-performance primes of relatively small size would be a welcomed addition to the RF lineup, especially the 24mm and 35mm.
Again, as a reminder these patent applications may not turn into an actual patent and may also never be developed as an official product by Canon. But it does give us a good glimpse into what Canon is looking at.
Source: Japan Patent Application 2023-120952 Via: digicame-info
They can extend the length of the lens a few mm.
I can't count how many times looking / reading and publishing about Canon patent applications over the last 5+ years I have thought this exact same thing ;)
Somehow I hope those to become true
キヤノン「10-20mm F2-2.8」「10-30mm F2-2.8」光学系に関する特許出願
If it is an APS-C design, the 10-21mm would be an interesting option for me (the other wouldn't be wide enough to replace my current EF-S wideangle zoom).