What also sets DSLRs apart is the 'depth of field' and 'bokeh'. Depth of field is the range of distance from the camera lens that is in focus. 'Bokeh' is simply the parts of a scene being captured that are 'out of focus' and appear softer. As you see in the pictures attached, the photographers have used the parts of scene that are not in focus to highlight the subject in focus. Achieving this on a point and shoot is difficult and needs lenses with larger aperture which narrows the depth of field and improves the bokeh effect.
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What kind of lenses do you suggest for a good "bokeh" effect when taking portraits?
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'Bokeh' simply makes the photograph look more natural, in the sense that even our eyes perceive the world similarly. When we look at any near field object, everything else looks fuzzy.
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'Bokeh' is not a natural visual phenomenon. It is definitely an optical phenomenon that is used in photography and enhanced by certain lens characteristics.
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Longer focal lengths and wider apertures are needed to create a beautiful bokeh. The lenses with these characteristics are usually referred to as portrait lenses. For example, a 50mm f2 lens or 85 mm f2 lenses are considered portrait lenses.
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An aperture of f2 or greater which means smaller 'f number' (like f1.8, 1.4 or 1.2) is usually needed to get a nice bokeh.
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There should be a reason why these photographs with 'bokeh' are so eye catching. I believe its because of how we perceive objects of interest in our field of vision.
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The eye-catching is the intention there. The idea is definitely to highlight the subject of interest in a scene, which works great for portrait photographs.
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