Photography Bokeh (Answered)
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Bokeh is a side effect of lens geometry. A lens, in any system, has a limited depth of distance where the image is sharply focused. Outside that range, the image is blurred. But, blurred isn’t always bad. In many artistic photographs, the photographer’s choices for focus make an important contribution to the overall look of the image.
In other applications, particularly moving imagery or scenes containing bright light sources at night, some optical effects caused by lens bokeh are unavoidable. For example, when there is a near focus field, to capture an image of something near the camera, and a bright source, like a distant plane light at night, the “out of focus” airplane light can appear distractingly large in the image. This can be further complicated by cameras with few aperture blades, causing the out of focus blob to have as few as 3 distinct “sides”. This gives a “big triangle” in the picture which wasn’t seen by the photographer’s eye. So while it’s arty in some images, it’s ugly in others.
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