Canon Patent for New 17-40mm and 16-35mm Lenses

Egami has spotted a new patent filed by Canon. The new patent describes the 17-40mm and 16-35mm lenses with apertures between f/2.8 and f/4.

This patent shows various wide angle optical designs and all of these lenses appear to be full frame. New 16-35mm and 17-40mm lenses could possibly be the replacements of the EF 17-40 f/4L and EF 16-35 f/2.8L II.

See below for the machine translated patent details.

Canon Patent for New 17-40mm and 16-35mm Lenses

Canon EF 16-35mm f/2.8L II USM

  • Patent Publication No. 2014-41245
    • Publication date 2014.3.6
    • Filing date 2012.8.22
  • Example 1
    • Focal length f = 16.49-23.55-33.95mm
    • Fno. 4.10
    • Half angle ω = 52.68-42.57-32.51 °
    • 14 pieces of 10-group lens configuration
  • Example 2
    • Focal length f = 17.50-25.45-38.90mm
    • Fno. 4.10
    • Half angle ω = 51.03-40.36-29.08 °
    • 15 pieces of 11-group lens configuration
  • Example 4
    • Focal length f = 17.50-24.82-38.89mm
    • Fno. 2.88-3.25-4.10
    • Half angle ω = 51.02-41.08-29.09 °
    • 15 pieces of 11-group lens configuration
  • Example 5
    • Focal length f = 16.50-25.34-34.00mm
    • Fno. 2.91
    • Half angle ω = 52.66-40.49-32.47 °
    • 15 pieces of 11-group lens configuration
  • Canon patents
    • 4-group zoom of positive and negative positive negative
    • Inner focus

via EG