The DW-4 is ideal for exacting duplicating, photomicrography, scientific research or astronomical photography. Its 6-element optics magnify the entire image (including data readouts) fully 6X magnification. Built in -5 to +3 diopter adjustment assures highest accuracy and comfort. It permits aerial (parallax) focusing with appropriate F3 screens. Other than it is an excellent finder, it also serves as a superior quality loupe for inspecting negatives and slides. It comes with a rubber eyepiece cup and eyepiece shutter.