The Leica Viewfinder Magnifier M 1.4x magnifies the viewfinder image by two fifths. It provides a major aide in framing the subject at focal lengths above 50 mm. The viewfinder 1.4x is recommended for focal lengths of 75 mm or more. By magnifying the rangefinder images, it greatly enhances focusing accuracy, especially when shooting at telephoto focal lengths. The 1.4 x viewfinder magnifier turns into magnification of 1x (0.95x with M8 Models); this combination allows comfortable viewing of the subject with both eyes. The viewfinder is simply screwed into the viewfinder ocular of the Leica M. A small chain attached to the Leica M's carrying strap eyelet prevents it from being lost or damaged. A leather pouch is supplied for safekeeping when it's not attached.