JM Smart Viewer Professional 3.2-Inch Screen Loupe - Smallest Loupe in the World Improved critical focus Viewing,Perfect for using the viewing screen in bright sun outstandingly suited to Live View and video filming,filming and photography free of camera shake thanks to additional support at the eye enlargements of the monitor image and sight defect correction from +1 to -2.5 dioptres no parallax distortion at close range such as occurs with optical viewfinders constant angle of vision on the display enable you to keep a reliable check on the exposure