Through the 4x Anastigmatic Loupe with One Scale from Peak, you can inspect a standard 32 x 45mm micro-film slide or negative and see the entire image area all at once. The 58mm field of view also allows you to examine the whole surface of flat objects measuring less than 58mm in diameter.  Thanks to optical correction for astigmatism, field curvature, and other aberrations, the loupe is sharp from the center to the edge of the image field. The effective pupil has been placed 25mm (1.0") above the upper edge of the loupe, enabling you to view the entire image field by moving only your eye. This convenient design makes it possible to inspect a great number of film slides or negatives quickly and efficiently. Additionally, an included metric scale with a cross-hair reticle gives you the ability to measure objects directly on the film plane.