Have you ever seen those nice portrait photos where the subject is in focus and the background is blurred out? That blurriness is an aesthetic called bokeh and this type of photo is achieved by having a shallow depth of field. Depth of field basically determines what’s in focus in the frame based on how far the subject is from the lens and shallow depth of field photos are great because they center your attention on what’s visibly identifiable …

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Rack Focus and the Gradual Presentation of Information