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

• 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