Lm Of Camera Microprism Focusing Screen
by Alfred Pasieka/science Photo Library
Title
Lm Of Camera Microprism Focusing Screen
Artist
Alfred Pasieka/science Photo Library
Medium
Photograph - Photograph
Description
Microprism focusing screen. Light micrograph of the microprism area of a camera's focusing screen. The centre circle of the screen contains a region filled with tiny, pyramidical prisms etched on the surface. If the camera lens is not correctly focused, the user sees a crazed image in the centre of the viewfinder. When the correct focus is achieved, the centre of the viewfinder appears to clear, showing a sharp image. Outside of this area, the screen is etched as a fresnel lens. This type of focussing screen is also used in photomicrography. Magnification x4 at 6x7cm size. Magnification: x6.5 at 5x4 inch size.
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September 13th, 2018
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