What is a
focal plane shutter?
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plane shutters are located at the focal plane.
35mm film SLR has a focal plane shutter
of two blinds or in newer cameras blades, positioned just in front of
where the film lies. One blind follows the other, forming a gap which,
passing rapidly across the film makes the exposure. This gap width is
controlled by the shutter speed dial. For speeds below 1/60 sec, the second
blind is delayed enough to expose the entire frame at once with one blind
completed its run before the other begins. With faster shutter speeds
the gap is reduced down to a thin slit.
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