Here's an interesting wide angle prime optical formula patent from Canon. It's a non-fisheye EF 10mm f/2.8 for full frame sensors.

Patent Publication No. 2015-102620 (Google Translated)

  • Published 2015.6.4
  • Filing date 2013.11.22

Example 3

  • Focal length f = 10.30mm
  • Fno. 2.88
  • Half angle of view ω = 64.54 °
  • Image height 21.64mm
  • Lens length 124.58mm
  • BF 38.00mm

I'm not sure if this would have been part of the EF 11-24mm f/4L development, or if we might actually see a 10mm f/2.8L prime one day. A replacement for the current EF 14mm f/2.8L II?

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