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
