Kaiser All-Purpose Magnifier 4.5xMagnification: 4. 5 fold Lens: 35mm Viewing field: 45 mm (suitable for 35 mm slides) Base magnifier with a high quality lens made of optical glass. Sharp, the distortion free image up to the edges. Eyesight correction from +1 to 2. 5 for individual adjustment to one's own visual acuity. Light weight, sturdy plastic housing. The translucent base for reflected and transmitted light originals.