Comparison of Carl Zeiss 18mm f/3.5 Distagon T* 3.5/18 and Tokina 20mm f/2 FE AF FiRIN [S]ave
| Attribute |  Carl Zeiss 18mm f/3.5 Distagon T* 3.5/18 × |  Tokina 20mm f/2 FE AF FiRIN × |
|---|---|---|
| Diagonal Angle of View (degree) | 99.00 | 92.70 |
| Notes | Available SLR mounts: Canon EF (ZE), Nikon F (ZF, ZF.2), Pentax K (ZK). Lens shade included. Nikon ZF.2 version includes CPU interface for autoexposu | For Sony Full-frame E-Mount; Bayonet type lens hood included. |
| Aperture (f) | 3.50 - 22.00 | 2.00 - 22.00 |
| Magnification Ratio (x) | 0.083 | 0.097 |
| Filter Size (mm) | 82 | 62 |
| Type | Wide Prime | Wide Prime |
| Closest Focus (m) | 0.3 | 0.28 |
| APS Equivalent | 1.5x: 27mm | 1.5x: 30mm |
| Lens Construction | 13 elements in 11 groups | 13 elements in 11 groups, including 2 aspherical and 3 Super-Low Dispersion (SD) elements |
| Image Circle | 35mm | 35mm |
| Focal Length (mm) | 18.00 | 20.00 |
| Brand | Carl-zeiss | Tokina |
| Name | Carl Zeiss 18mm f/3.5 Distagon T* 3.5/18 | Tokina 20mm f/2 FE AF FiRIN |
| Weight (g) | 470 | 464 |
| Diameter (mm) | 87 | 73.4 |
| Length (mm) | 84 | 81.5 |
| Diaphragm Blades | - | 9 |
| Focus Details | Manual focus only | Internal AF with Ring-Type Ultrasonic Motor; Full-Time Manual Focus Override |
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