Pentax SMC FA 31mm f/1.8 AL Limited
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| Weight: | 345 g |
| Brand: | Pentax |
| Description: | Mount: Pentax KA/KAF/KAF2/KAF3, lens type: wide-angle, focal length: fixed, prime lens focal length: 31 mm, aperture F at min. focal length: 1.80 |
| Type: | Lens |
| Length: | 68.5mm |
| Diameter: | 65 mm |
| Focal length: | Permanent |
| Lens type: | Wide angle |
| Max viewing angle: | 70 deg.min |
| Minimum focus distance: | 0.3 m |
| Focal length of prime lens: | 31 mm |
| Bayonet: | Pentax KA/KAF/KAF2/KAF3 |
| Filter thread diameter: | 58 mm |
| Aperture F at min. focal length: | 1.8 |
| Minimum aperture F: | 22 |
| Number of element groups: | 7 |
| Number of elements: | 9 |