Opteka 500mm f/8 Canon EF
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| Weight: | 360 g |
| Brand: | Opteka |
| Description: | Mount: Mamiya 645, lens type: standard, focal length: variable, min. focal length: 55 mm, max. focal length: 110 mm, aperture F at min. focal length: 4.50, aperture F at max. focal length |
| 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: | Canon EF |
| 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 |