Egami has discovered two new Canon patents for super zoom lenses. One of the lenses Canon filed patent for APS-C cameras (18-200mm f/3.5-5.6), the other one is for full-frame (28-200mm f/3.5-5.6) cameras.
Both lenses are image stabilized and most probably to use for future kit lenses.
Canon 18-200mm and 28-200mm Super Zoom Lenses Patent Details
- Patent Publication No. 2013-97184
- Publication date 2013.5.20
- Filing date 2011.11.1
- Example 1
- Zoom ratio 10.39
- Focal length f = 18.60-60.40-193.27mm
- Fno. 3.48-4.98-5.88
- Half angle ω = 36.27-12.74-4.04 °
- Image height 13.65mm
- 144.58-176.50-208.42mm overall length of the lens
- BF 38.09-63.96-77.06mm
- 16 pieces of 13-group lens configuration
- Four four-sided aspherical
- The effective diameter of the front lens 55.82mm
- MOD 0.5m
- Example 3
- Zoom ratio 6.69
- Focal length f = 28.90-76.87-193.28mm
- Fno. 3.60-5.27-5.88
- Half angle ω = 36.82-15.72-6.39 °
- Image height 21.64mm
- 144.56-176.58-208.59mm overall length of the lens
- BF 38.00-66.95-76.98mm
- 15 pieces of 11-group lens configuration
- Four four-sided aspherical
- The effective diameter of the front lens 62.81mm
- MOD 0.5m
- Canon patent
- 5-group zoom positive and negative negative positive positive
- Inner Focus (third group)
- Because it is possible to reduce the beam effective diameter of the first group, can be miniaturized optical system
- Image stabilization
