Syvyyskenttävaihtelu

Syvyyskenttävaihtelu, also known as depth of field variation or depth of field shifting, is a cinematographic technique where the depth of field is intentionally altered during a shot. This is typically achieved using specialized lenses or camera movements that allow the focus plane to shift from one subject to another within the frame. The purpose of syvyyskenttävaihtelu is to guide the viewer's attention, reveal new information, or create a specific emotional effect. For instance, a director might shift focus from a foreground character to a background detail to emphasize a connection or a hidden element. Conversely, shifting focus away from a character can create a sense of isolation or detachment. This technique differs from a simple rack focus, which is a more abrupt change in focus, by often being a smoother, more gradual transition. Syvyyskenttävaihtelu requires precise camera operation and a clear understanding of the narrative intent to be effective. It is a subtle yet powerful tool that can significantly enhance storytelling and visual composition in filmmaking. The effect can be achieved through motorized focus systems or by skilled camera operators manually adjusting the focus ring. The choice of lens and the speed of the focus shift are critical factors in determining the impact of the technique.