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Focal-plane shutters can be built into the body of a camera that accepts interchangeable lenses, eliminating the need for each lens to have a central shutter built into it. Their fastest speeds are either 1/4000 second, [2] 1/8000 second, [3] [4] or 1/12000 second; [1] much higher than the 1/500 second of the typical leaf shutter. [5]
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). Some electronic flashes can produce a longer pulse compatible with a focal-plane shutter operated at much higher shutter speeds.
Since the optical centers of the cameras lenses are distinct, each center projects onto a distinct point into the other camera's image plane. These two image points, denoted by e L and e R, are called epipoles or epipolar points. Both epipoles e L and e R in their respective image planes and both optical centers O L and O R lie on a single 3D ...
Optically designed as a reverse telephoto to enable the lens to fit into a standard mount as the focal length can be less than the distance from lens mount to focal plane. Long-focus lens - a lens with a focal length greater than the diagonal of the film frame or sensor. Long focus lenses are relatively simple to design, the challenges being ...
Other focal-plane shutter designs, such as the Copal Square, travelled vertically — the shorter travelling distance of 24 millimetres (as opposed to 36 mm horizontally) meant that minimum exposure and flash synchronisation times could be reduced. These shutters are usually manufactured from metal, and use the same moving-slit principle as ...
The reticle may be located at the front or rear focal plane (First Focal Plane (FFP) or Second Focal Plane (SFP)) [8] of the telescopic sight. On fixed power telescopic sights there is no significant difference, but on variable power telescopic sights the front plane reticle remains at a constant size compared to the target, while rear plane ...
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The axis of rotation is the intersection of the lens's front focal plane and a plane through the center of the lens parallel to the image plane, as shown in Figure 3. As the image plane is moved from IP 1 to IP 2, the PoF rotates about the axis G from position PoF 1 to position PoF 2; the "Scheimpflug line" moves from position S 1 to position S ...