You probably want a 50mm in your situation. The only question is if you want the 50mm f/1.8G or the 50mm f/1.8D lens. If your camera has a focus motor, you can get the 50mm f/1.8D lens, which is less expensive but not quite as good as the 50mm f/1.8G. Personally, I'd get the 50mm f/1.8G either way since it's a better lens and not too much more. But know that if you choose the f/1.8D you need to be sure your camera model has a focus motor of its own, and many Nikon crop sensor cameras don't.
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