The Peak 4x Loupe uses a high-resolution achromatic lens whose chromatic aberration has been corrected. With its wide square vision of 45 x 45mm and a clever and smart body design, it will be useful not only in your daily life but also in various fields as an able assistant for precision works.Semi-transparent and black bottom skirts are provided which allow a one-touch changing operation. The semi transparent skirt is used for checking photographic films, and the black skirt for checking the focus of a large format camera.For the focus adjustment of this loupe, a multi-groove screw helicoid system is employed, which is ordinarily used for camera lenses, ensuring very smooth operation. The attached neck strap keeps the loupe handy.