Under sharp focus, however, this phenomenon will not occur, and the center of the Siemens Star will be clear and crisp. Due to a scientific phenomenon known as spurious resolution, a Siemens Star, when not under sharp focus, will contain optical blur, causing the black spokes to take the place of the white spokes, and vice versa. Siemens Stars work by containing multiple spokes, each of which is an exact distance apart from the others, and meet only in the middle of the star. Our app is simple, convenient, and easy to use, and it’s completely free! With the Focus Chart app, you’ll never have to frantically search for your physical focus chart again. If you’re a camera operator, focus puller, or photographer, you know how crucial it is to ensure that your subjects in frame are sharp and in focus.
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