Split Diopter Shot in film

THE SPLIT DIOPTER lens is a piece of half convex glass that attaches to the main lens of the camera. This makes half the lens nearsighted while the other half remains farsighted; creating the illusion of a deep focus. This technique is used to convey more information in a single shot, as well as creating a sense of uneasiness for the viewer.
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The Split Diopter allows for Deep Focus cinematography but requires much less light. It also delivers a distinctive look that blends sharp and out-of-focus imagery all in one frame. Subjects in both foreground and background can be kept in focus.
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Split Diopters help achieve the cinematic and story goal of emphasizing subjects as needed by the Director and DP. When utilized for decisive or important moments…they can visually amplify the dramatic tension for the viewer. If used too often, just like with any other technique, the magic of this tool will diminish and the effect will become obvious.