Canon has patented a new telephoto zoom lens in Japan. The new patent describes the EF 70-200mm F2.8 DO lens designed for Canon DSLRs with full-frame image sensors.
The company already has a telephoto lens for the Canon SLR system and it is the EF 70-200mm f/2.8L IS II USM model. If the patent becomes live in production, it will be the replacement for this telephoto zoom optic in the EOS system with DO featuring diffractive optics.
Canon lenses which feature the diffractive optical (DO) are smaller and lighter compared to the same focal length lenses but the price becomes generally higher when the lenses have optical formual for DO.
Canon EF 70-200mm F2.8 DO Lens Patent
The patent for the EF 70-200mm F2.8 DO telephoto zoom lens for full-frame Canon DSLR cameras can be seen below. It is suggested that this lens will be announced before 2020 olympics.
- Patent Publication No. 2016-80877
- Published 2016.5.16
- Filing date 2014.10.17
- Example 1
- Zoom ratio 2.69
- Focal length 72.15 134.00 193.98
- F-number 2.91 2.91 2.91
- Angle of view 16.69 9.17 6.36
- Image height 21.64
- The total lens length 223.50 223.50 223.50
- BF 45.35 45.35 45.35