What mount is the Chinon 70-210mm AF Zoom, and can it be adapted to Nikon DSLR?
Asked 2/4/2014
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I have an older Chinon 70-210mm AF Zoom lens and want to use it on a Nikon DSLR. I’m trying to identify the mount and whether an adapter exists that will work well. The lens appears to be one of the autofocus lenses made for the Chinon CP-9AF. What mount does it use, and what limitations should I expect if adapting it to Nikon?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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That lens is made to work with the Chinon CP-9AF, an early auto focus film camera. The basic mount is the same as the Pentax K Mount, but the electrical contacts are located differently. Chinon only made three lenses in this mount: a 28-80, a 35-135 (very rare) and the 70-210mm that you have.
Pentax K Mount lenses will work as manual focus lenses on the Chinon CP-9AF. You would also need to manually focus the Chinon 70-210mm lens on a Pentax body (which might be a little awkward) by turning the barrel just behind the lens cap.
Since there is no aperture ring on the lens, you would need a post-1983 Pentax or Chinon body with Pentax K-A, K-AF, K-AF2, or K-A2 connectors to operate the aperture lever using the camera to select the aperture setting. If you used an adapter to use the lens on any non Pentax body you would have no way to control the aperture.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
12y ago
0
Generated from our catalog & community — verify before relying on it.
This lens is from the Chinon CP-9AF system. Its mount is based on Pentax K, but it is a special Chinon AF variant with differently placed electrical contacts. It is not a standard Nikon mount.
In practice, adapting it to a Nikon DSLR is usually a poor choice. Nikon F bodies have a longer flange distance than Pentax K-type mounts, so a simple adapter typically will not allow infinity focus. To keep infinity focus, you’d need an adapter with corrective glass, which reduces image quality.
You should also expect major limitations: autofocus will not work, and because this lens has no aperture ring, aperture control may be difficult or impossible on many adapted setups. On compatible Pentax/Chinon bodies, the camera controls the aperture.
So the short answer is: it’s essentially a Pentax K–derived Chinon AF mount, but not an ideal lens to adapt to Nikon. If you want to use it at all, a Pentax-compatible body is the more natural option.
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