New Patent: Canon EF 20-45mm f/2.8-4 Lens
Canon has filed a new lens patent: EF 20-45mm f/2.8-4 Lens, which is designed for Canon full frame DSLR cameras.
Take a look at the patent details below translated by Google.
Patent Publication No. 2015-197593
- Published 2015.11.9
- Filing date 2014.4.1
Example
- Zoom ratio 2.25
- Focal length f = 20.00 23.60 45.00
- Fno. 2.75 2.90 4.16
- Half angle of 47.25 42.51 25.68
- Image height 21.64 21.64 21.64
- Overall length 158.28 156.32 173.36
- BF 42.05 46.10 73.14
via: Egami
Read more: Canon Patents