I own a Nikon D3100 and I'm looking for blurry backgrounds, so I'm looking for a lens with a very good depth of field to make backgrounds blurry. I prefer closeups, but it doesn't really matter. Also, not too expensive!
Added (1). Yeah I realized that I mixed up the two meanings, I meant a small depth of field.
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What Nikon lens is good for a great depth of field?