To achieve bokeh in an image, you need to use a fast lens—the faster the better. You'll want to use a lens with at least an f/2.8 aperture, with faster apertures of f/2, f/1.8 or f/1.4 being ideal. Many photographers like myself like to use fast prime lenses when shooting photographs that they want visible bokeh in. Another name for bokeh is depth of field it makes the subject stand out by blurring out the objects in the background. I prefer this because it makes images more dramatic and the focus is the person or subject rather than get distracted by the background. In nature shots this is the most preferred style of picture, for example if you take a picture of a leaf you want just the leaf in the shot not the tree and other leafs.
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