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The D3100 has a standard Nikon F mount with AF contacts. The F mount is the same mount Nikon has used for ages. All Nikon /.Nikkor lens fit this mount. There are a few older lens that may not fit due to manual connections, but those are highly specialized and few and far between. Since you have a Pentax Lens with a Pentax K mount, the answer is No, you cannot use those lens on any Nikon camera.
Sorry, there was a problem. Please try again later.Usage of Film Auto Focus lenses can be limited. It is best to check what cameras are compatible with the specific lens model you have. Pentax lenses generally only work with Pentax bodies.
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