Microprism
Glossary Terms
Microprism collar surrounding split image spot image by Voxphoto (Image rights) |
A microprism is a focusing aid made of an area very small prisms built in to a focusing screen; this causes a slightly out-of focus image to "sparkle" or "shatter" compared to the surrounding plain ground-glass screen. Microprisms are often used in SLRs, often in combination with a split-image device.
Removable Olympus focusing screen; microprism ring surrounds split-image center image by Tim Williams (Image rights) |