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Recording a subject behind a dirty or dusty window The subject behind the window will not be focused because the focus is on the dirty window. Similarly, when recording something on the opposite side of a road with heavy traffic, a vehicle that happens to pass by may be brought into focus. Recording a subject that is surrounded by objects with glossy surfaces or by highly reflective objects Since whatever is shiny or glistens is brought into focus, it is hard to focus on the subject to be recorded. The focus may become blurry when recording subjects at the beach, at night or in scenes involving fireworks or special lights. Recording a subject in dark surroundings The unit cannot focus correctly because the light information that comes through the lens decreases considerably. Recording a fast-moving subject As the focus lens-inside moves mechanically, it cannot keep up with a fast-moving subject. When, for example, recording a sports event with fast moving subjects, the focus may lose its sharpness. Recording a subject with little contrast It is easy to bring subjects with a sharp contrast or vertical lines or stripes into focus. This means that a subject with little contrast, such as a white wall, may become blurry because the unit achieves focus based upon the vertical lines of an image.
