The HoodLoupe 3.0 is engineered to give you a 1 to 1 ratio for true LCD screen viewing. You may be tempted to use an old Loupe with a single magnifying lens to view your LCD screen outdoors. Some competitors who do not understand LCD screen viewing will offer you a single lens magnifying solution as well. You will find as we did, that magnification just makes the pixels of an LCD screen bigger resulting in image distortion. Making the call on focus is very difficult when your image is over pixilated through optical magnification. The HoodLoupe 3.0 uses 3 German glass lenses in its optical solution and is guaranteed to give you the best optical solution for viewing your LCD screen in the field.