Opteka 500mm f/8 Pentax KA/KAF/KAF2/KAF3
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| Weight: | 360 g |
| Brand: | Opteka |
| Description: | Mount: Pentax KA/KAF/KAF2/KAF3, lens type: macro lens, focal length: fixed, prime lens focal length: 500 mm, aperture F at min. focal length: 8, Aperture F at max. focal length: 8, fu |
| Type: | Lens |
| Functions: | Macro mode |
| Length: | 86.4 mm |
| Diameter: | 76.2 mm |
| Focal length: | Permanent |
| Lens type: | Macro lens |
| Minimum focus distance: | 0.14 m |
| Focal length of prime lens: | 500 mm |
| Bayonet: | Pentax KA/KAF/KAF2/KAF3 |
| Filter thread diameter: | 72 mm |
| Aperture F at max. focal length: | 8 |
| Aperture F at min. focal length: | 8 |
| Zoom in macro mode: | 0.4 |
| Number of element groups: | 8 |
| Number of elements: | 9 |