A patent application showing the optical formula for an EF 10mm f/2.8 prime lens has been filed in Japan.
Japan Patent Application 2018-233223:
- Focal length: 10.30mm
- F number: 2.88
- The half angle of view: 64.54°
- Image height: 21.64mm
- Lens length: 124.58mm
- Back focus: 38.00mm
It looks like this patent may have been a part of the EF 11-24mm f/4L USM development.
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38mm is pretty normal on wide angle lenses for EF.
Patent: Canon EF 10mm f/2.8
I doubt we'll ever see this lens. When Canon decides to make a lens, we sometimes see the lens before the patent, not three years after.
My guess is Canon looked at the sales of the Voighlander 10mm for Sony E mount, and possibly the EF 11-24mm, decided there's no profit in a 10mm prime, and left it on the shelf.
It's more than that, it is the patent of the optical formula of the EF 11-24mm f/4L USM.
Example 1 of the patent:
Canon EF 11-24mm f/4L USM:
Ahem!... See above.
Of course production can precede patent grant, hence 'patent pending'.