Ar-K 16mm f/2.8
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| Weight: | 310 g |
| Brand: | Zenith |
| Description: | Mount: Pentax KA/KAF/KAF2/KAF3, lens type: ultra wide angle fisheye, focal length: fixed, prime lens focal length: 16 mm, aperture F at min. focal length: 2.80 |
| Type: | Lens |
| Length: | 49 mm |
| Diameter: | 63 mm |
| Focal length: | Permanent |
| Lens type: | Ultra wide angle fisheye |
| Max viewing angle: | 180 deg.min |
| Minimum focus distance: | 0.3 m |
| Focal length of prime lens: | 16 mm |
| Bayonet: | Pentax KA/KAF/KAF2/KAF3 |
| Filter thread diameter: | 26 mm |
| Aperture F at min. focal length: | 2.8 |
| Minimum aperture F: | 22 |
| Number of element groups: | 7 |
| Number of elements: | 10 |