PEAK photographers large format loupe. A must for all professional photographers loupe is used for the inspection of negatives and pictures, as well as checking the focus on cameras. It has a high resolution achromatic lens that has been corrected for any chromatic aberration and is adjustable for individual focusing. The wide, square body makes it useful for many high precision, wide field inspection applications. This loupe comes with two bottom skirts (one semitransparent and one black) that can be easily interchanged. The semitransparent skirt is ideal for checking photographic films, and the black skirt is used to check the focus on large format cameras. Focus adjustment is made with a multi-groove screw helicoid system which is the same type that is used for camera lenses. 4X magnification, 1.77" x 1.77" field view. Measures 2" length by 2" width by 2-71/128" height.