Difference between revisions of "Split prism"
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|image_text=Focusing screen with a split-image device in<br>the centre, surrounded by a [[microprism]] ring | |image_text=Focusing screen with a split-image device in<br>the centre, surrounded by a [[microprism]] ring | ||
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| − | In a reflex camera's focusing screen, a '''Split-Image''', sometimes called a '''split image rangefinder''' or '''Split-Prism'', is an optical focus-assistance device that displays an image divided in two. When the image is out of focus, the two halves of the image are separated; when in focus, the halves line up to form a single image. The split is often horizontal, but sometimes diagonal. | + | In a reflex camera's focusing screen, a '''Split-Image''', sometimes called a '''split image rangefinder''' or '''Split-Prism''', is an optical focus-assistance device that displays an image divided in two. When the image is out of focus, the two halves of the image are separated; when in focus, the halves line up to form a single image. The split is often horizontal, but sometimes diagonal. |
Split-image devices are often combined with [[microprism]]s. | Split-image devices are often combined with [[microprism]]s. | ||
Split-image devices in focus screens should not be confused with the [[rangefinder (device)| twin-window, or coincident rangefinder]], fitted to [[rangefinder camera]]s. | Split-image devices in focus screens should not be confused with the [[rangefinder (device)| twin-window, or coincident rangefinder]], fitted to [[rangefinder camera]]s. | ||
Revision as of 16:58, 7 September 2008
Glossary Terms
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| Focusing screen with a split-image device in the centre, surrounded by a microprism ring |
In a reflex camera's focusing screen, a Split-Image, sometimes called a split image rangefinder or Split-Prism, is an optical focus-assistance device that displays an image divided in two. When the image is out of focus, the two halves of the image are separated; when in focus, the halves line up to form a single image. The split is often horizontal, but sometimes diagonal.
Split-image devices are often combined with microprisms.
Split-image devices in focus screens should not be confused with the twin-window, or coincident rangefinder, fitted to rangefinder cameras.
