Đây là bằng sáng chế ống kính góc rộng rất thú vị của Sigma.
Example 1
- Focal length: 10.30-17.50
- F value: 2.92
- Half-angle: 113.01-77.05
- Image height: 14.20
- Total length: 87.92-78.73
Example 3
- Focal length: 9.30-17.46
- F value: 2.92
- Half-angle: 119.04-76.76
- Image height: 14.20
- Total length: 91.76-80.59
Example 4
- Focal length: 12.41-23.19
- F value: 4.12
- Half-angle: 125.22-84.49
- Image height: 21.63
- Total length: 118.84-115.61
Example 5
- Focal length: 10.35-23.17
- F value: 4.12
- Half-angle: 133.29-84.55
- Image height: 21.63
- Total length: 129.00-130.98
