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Reference.org
Focusing screen
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<p>A focusing screen is a flat translucent material, either a <a href="/facts/Ground_glass/dbceXmJo">ground glass</a> or <a href="/facts/Fresnel_lens/WYbDj3sn">Fresnel lens</a>, found in a <a href="/facts/System_camera/8KwyKjf3">system camera</a> that allows the user of the camera to preview the framed image in a <a href="/facts/Viewfinder/aqgJoAYB">viewfinder</a>. Often, focusing screens are available in variants with different etched markings for various purposes. For instance, when photographing landscapes, a focusing screen with a grid allows the photographer to keep the horizon straight. Modern <a href="/facts/Mirrorless_camera/dWbPnzRF">mirrorless cameras</a> do not need a focusing screen since they display what the <a href="/facts/Image_sensor/j3GNrRln">image sensor</a> sees on a <a href="/facts/Flat-panel_display/jw0LWETN">flat-panel display</a> or <a href="/facts/Electronic_viewfinder/HaCE5LvL">electronic viewfinder</a>. </p>