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A fresnel screen (lens) is an accessory for a groundglass focusing screen. It helps "even-out" the brightness of the groundglass image and make the image appear brighter. The effect is more noticeable with wide angle lenses. Fresnel lenses are essential when using reflex housings. Fresnel screens are standard equipment on Horseman models LS, LX, LX-C, FA and HD.
To install this fresnel screen on an LE, the groundglass must be removed. The fresnel is then placed in the frame first and the groundglass goes back in its original position. The "rough" side of the fresnel lens should contact the "ground" side of the groundglass.
In some applications it may be desirable to have a conveniently removable fresnel screen. Horseman also offers a Snap-On Attachment Kit (#47023831) for mounting the fresnel on the "photographer's side" of the groundglass. With this kit the fresnel can be magnetically attached and detached.