Asobinet spotted a newly published Sigma patent that described the optical design of the 28mm f/1.4 DG DN and 14mm f/2 DG DN lenses.
- Focal length: 14.48
- F-value: 2.07
- Angle of view: 114.27
- Image height: 21.63
- Total length: 128.00
- Back focus: 20.0000
- Focal length: 27.50
- F-value: 1.46
- Angle of view: 76.53
- Image height: 21.63
- Overall length: 113.50
- Back focus: 21.7787
Digicameinfo spotted a patent for two Tamron 90mm lenses:
- 90mm F2 (1x magnification)
- 90mm F2.8 (2x magnification)
Asobinet spotted a Tamron prime lens patent:
- 16mm f/2.8