- Nikon AF Mount.
- Does not have Built-In Motors for auto-focus
- Does not Auto-focus on all Nikon DSLRs
80-400/4.5-5.6 AT-X 840 D Telephoto Zoom Lens for NIkon D USA This was the smallest zoom lens available that had a bright f/5.6 aperture at 400mm. Now Tokina has recreated the lens for the digital age. Still the smallest SLR lens available that zooms to 400mm, the AT-X 840 AF D has a smooth and quick internal focusing system that means the all-metal inner barrel that houses the heaviest glass elements does not have to rotate when the lens focuses, making it much faster than the previous models.