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The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question; that is, = /. Given the same 3:2 aspect ratio as 35mm's 36 mm × 24 mm area, this is equivalent to the ratio of heights or ratio of widths; the ratio of sensor areas is the square of the crop factor.
The image circle is the cross section of the cone of light transmitted by a lens or series of lenses onto the image plane. When this light strikes a perpendicular target such as photographic film or a digital camera sensor, it forms a circle of light – the image circle. Various sensor aspect ratios may be used which all fit inside the same ...
The apparent difference in proportions results solely from the content added around the edges of the frame in the normal lens photo and the wide-angle photo. Photos taken using a 35 mm still camera at a constant distance from the subject with a 28 mm lens, a 50 mm lens and a 70 mm lens.
According to SMPTE-301 [1] (Theatre Projection Leader), there shall be 4 frames of motor cue, followed by 172 frames of picture, followed by 4 frames of changeover cue, followed by 18 frames of picture. That puts the motor cue at frames 198–195 from the end of the picture section of the reel (12.34 to 12.15 feet; or 12-foot-6-frames through ...
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A throbber animation like that seen on many websites when a blocking action is being performed in the background. A throbber, also known as a loading icon, is an animated graphical control element used to show that a computer program is performing an action in the background (such as downloading content, conducting intensive calculations or communicating with an external device).
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