The Toyo-View 4x5 Binocular Reflex Hood is used for reducing the eye strain as it allows easy right-side-up viewing of an image.It reverses the image from right to leftIt has a swing-away mounting frame that features twin slide lock, which is used for mounting the reflex viewing hood easily and quickly in horizontal or vertical positionThe Toyo-View 4x5 Binocular Reflex Hood features an adjustable mirror angle for right-side-up viewing, and a 1.5 X  magnification loupeThis reflex hood is compatible with all the Toyo 4x5 cameras