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When using a focal-plane shutter with a flash, if the shutter is set at its X-sync speed or slower the whole frame will be exposed when the flash fires ( otherwise only a band of the film will be exposed ).
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When and using
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When using the works of his authorities Alexander does not only review their reasoning but also gives conclusions, expands on them, and offers his agreements and disagreement with them.
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When and focal-plane
When photographing rapidly moving objects, the use of a focal-plane shutter can produce some unexpected effects, since the film closest to the start position of the curtains is exposed earlier than the film closest to the end position.
* When using a flash on a camera with a focal-plane shutter, exposure time is limited to the maximum speed — often 1 / 250th of a second, at best — at which the entire film or sensor is exposed to light at one instant.
When and shutter
When the shutter is released, the mirror moves out of the light path, and the light shines directly onto the film ( or in the case of a DSLR, the CCD or CMOS imaging sensor ).
When an image is taken, the mirror moves upwards from its resting position in the direction of the arrow, the focal plane shutter ( 3 ) opens, and the image is projected onto the film or sensor ( 4 ) in exactly the same manner as on the focusing screen.
When a slower shutter speed is selected, a longer time passes from the moment the shutter opens till the moment it closes.
When slower shutter speeds, in excess of about half a second, are used on running water, the photo will have a ghostly white appearance reminiscent of fog.
When the shutter release is pressed, a light-blocking shield lifts and the shutter disc rotates a full turn exposing the film through its open sector ; when the pressure is released the light-blocking shield returns to its position behind the lens, and the spring motor advances the film and recocks the shutter.
When the shutter is completely covering the film gate, the film strip is being moved one frame further by one or two claws which advance the film by engaging and pulling it through the perforations.
When the shutter is cocked again the shutter curtains are moved back to their starting positions, ready to be released.
When the shutter is recocked the shutter curtains are wound back to the right hand side ready for the next exposure.
When the shutter is recocked both shutter curtains are wound back to the right hand side ready for the next exposure.
When using most Zorki cameras, the shutter speed should only be set after the shutter has been cocked.
When LCD shutter glasses are used for stereo 3D displays, the effective refresh rate is halved, because each eye needs a separate picture.
When photographing sports or high-speed phenomena, shutter priority with short exposures can ensure that the motion is effectively frozen in the resulting image.
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