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Kamerastore Digital Database
Nikon 20mm f2.8 AF Nikkor - Lens
Nikon 20mm f2.8 AF Nikkor - Lens
Autofocus wide angle lens made for F mount SLRs by Nikon starting in 1989. This lens was one of the first autofocus lenses produced by Nikon and uses the same optical formula as the AI-S version released in 1984. Autofocus requires a body with a built-in focus motor. Has the AI ridge and AI-S indent, so will meter on most manual Nikon cameras (excluding F, F2, and Nikkormats) and will work with advanced program modes. Plastic and metal body available in black.
- Nikon 20mm f2.8 AF Nikkor (12 elements, 9 groups)
- Minimum focus distance: 0.25m
- Aperture blades: 7
- Size: 69 x 52mm
- Weight: 258g
Nikon F
Nikon introduced their first SLR, the Nikon F, in 1959. Alongside it they unveiled a series of lenses and a new lens mount that would carry them to professional success for the next decades. To this day, all Nikon DSLRs use the Nikon F mount.
In the beginning, Nikon lenses communicated aperture information to the body using a metal coupling fork, affectionately known as "bunny ears". Soon after, Nikon began using a similar system that automatically told the camera the maximum aperture of the lens. This Automatic Indexing (AI) system stuck around for decades in lenses and is still found on Nikon's high-end professional DSLRs even though new lenses communicate this information electronically.
With only minor compatibility issues (don't use a pre-AI lens on AI bodies or modern digital cameras), Nikon F lenses and bodies are pretty much interchangeable.
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