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The Linhof 5 x 7" Fresnel Screen is an accessory lens for use on a ground glass focusing screen. It helps to create even illumination across the entire ground glass and make the image appear brighter. The effect is more noticeable when working with wide angle lenses as they have greater light fall-off towards the edges when the aperture is at its maximum value. Fresnel lenses are especially suited to working reflex housings since the light is traveling further than just to the ground glass itself.