Opteka 420-800mm f/8.3 Pentax KA/KAF/KAF2/KAF3
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| Weight: | 520 g |
| Brand: | Opteka |
| Description: | Mount: Pentax KA/KAF/KAF2/KAF3, lens type: telephoto, focal length: variable, min. focal length: 420 mm, max. focal length: 800 mm, aperture F at min. focal length: 8.30, Aperture F at max. fork |
| Type: | Lens |
| Length: | 222.25 mm |
| Max. focal length: | 800 mm |
| Min. focal length: | 420 mm |
| Focal length: | Variable |
| Lens type: | Telephoto lens |
| Zoom ratio: | 1.9x |
| Minimum focus distance: | 1.6 m |
| Bayonet: | Pentax KA/KAF/KAF2/KAF3 |
| Filter thread diameter: | 62 mm |
| Aperture F at max. focal length: | 8.3 |
| Aperture F at min. focal length: | 8.3 |
| Minimum aperture F: | 16 |
| Number of element groups: | 2 |
| Number of elements: | 4 |