A glare blocking viewfinder device includes a shadow box with a lens at a first end and an attachment mechanism at a second end adapted to detachably mount the device on a monitor screen of a camera. This enables a user to observe an image-bearing surface of the screen by looking at the image-bearing surface through the lens. The lens has a predetermined focal length and the depth dimension of the shadow box is substantially equal to this focal length. The attachment mechanism upon mounting the device to the monitor screen provides a substantially rigid structure. The user presses his or her eye against the lens to view the monitor screen through the lens and shadow box and points the camera at a subject, keeping the camera on the subject by using the device as a viewfinder. The user holds the camera with one hand and the attached device with the other hand. The device is collapsible and conveniently fits into a pocket of the user when not being used.