Patent: EF-M 18-40 Pancake

Patent: EF-M 18-40 Pancake

A patent showing an EF-M 18-40  f/3.5-5.6 pancake has come to light. With this patent a bunch of other optical formulas also appear, such as an 18-55 pancake, 10-20, and a 9-18. We currently have an EF-M 11-22, which is probably rooted from the latter two optical formulas.

A zoom pancake would be a nice addition to the geographically fragmented and oddly marketed EOS M line.

  • Patent Publication No. 2014-6275
    • Publication date 2014.1.16
    • Filing date 2012.6.21
  • Example 7
    • Zoom ratio 3.00
    • Focal length f = 18.10-37.01-54.30mm
    • Fno. 4.20-6.20-8.20
    • Half angle ω = 36.92-20.17-14.06 °
    • Image height Y = 13.60mm
    • 64.74-56.63-62.13mm lens length
    • BF 0.50mm
  • Canon patents
    • The possible vibration damping by the second lens group
    • Feeding whole, front focus, focusing, rear focusing, etc.

Source: [EG]

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