The focal plane of a This is about the optical device. For other uses, see the list at lens. A lens is a device for either concentrating or diverging light, usually formed from a piece of shaped glass. Analogous devices used with other types of electromagnetic radiation are also called lenses: for instance, a microwave...
lens is a In mathematics, a plane is the fundamental two-dimensional object. Intuitively, it may be visualized as a flat infinite piece of paper. Most of the fundamental work in geometry, trigonometry, and graphing is performed in two dimensions, or in other words, in a plane. Given a plane, one can introduce...
plane that is perpendicular to the axis of the lens and passes through its focus.
The main advantages of the focalplane shutter is that the interchangeable lenses do not each need to have a central shutter built into them, and quite fast effective shutter speeds are possible.
The traditional type of focalplane shutter in 35mm cameras, pioneered by the Leica camera company, uses two shutter curtains that run horizontally across the film plane.
One limitation of the focalplane shutter is that the flash synchronisation speeds are generally quite slow.
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