The Horseman Binocular Direct Viewer can be used in viewing images on the groundglass. It is compatible with the Horseman 4 x 5 cameras.It is mounted onto the bellows, which can be adjusted to provide required viewing angleThe Horseman Binocular Direct Viewer helps in modifying the magnification of the parts or entire frameThe +3 dioptric magnified glasses are used in viewing the images on the groundglass