Hoodloupe Professional is worn around your neck just like a normal loupe. When it is time to review your shot; bring Hoodloupe up to your image and place your eye up to the eye cup for complete glare free viewing. Hoodloupe has a +-3 diopter to accommodate those with less than perfect vision. Hoodloupe adjusts focus just like a binocular eye piece... you turn the eye piece in or out to setfor your vision. Without magnification . Each Hoodloupe is encased in a user friendly rubber for comfort and protection from bumps that will occur throughout your shoot. Comfortable lanyardand compact protective storage case included. Fits up to 3.0 inch LCD screens.