Canon Patent for EF-S 20mm f/2.8 STM Pancake Lens

Canon filed a new patent in Japan. The new patent describes the EF-S 20mm f/2.8 STM pancake lens designed for Canon DSLRs with APS-c image sensors.

The patent application is pretty close to the 24mm f/2.8 STM pancake though it will offer a 35mm focal length equivalent of 32mm. The EF-S 20mm f/2.8 STM pancake lens comes with a Stepping Motor.

If the lens becomes available into production, it will be a versatile lens for EOS 7D Mark II users. See the EF-S 20mm f/2.8 STM lens patent details.

Canon EF-S 20mm f/2.8 STM Pancake Lens Patent


Patent Publication No. 2015-111192 (Google Translated)

  • Published 2015.6.18
  • Filing date 2013.12.6

Example 3

  • Focal length 20.65mm
  • Fno. 2.88
  • Half angle of view ω = 33.48 °
  • Image height Y = 13.66mm
  • Overall length of the lens 64.00mm
  • BF 35.30mm

Canon patents

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via Egami