Focal length of camera lenses?

The amount of blur is determined by the aperture. A more "blurry" background is generally better, as it isolates the subject from the background more effectively. A wide aperture of 1.8 will create more bokeh than a f2.8 or a f5.6 aperture.

A Nikon D3200 + a 35mm f1.8 AF-S lens will work well together for portraits and nice bokeh.

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