sentences:  In the reflex camera, the light from the lens is projected onto a focusing screen.The waist-level finder makes this screen viewable from above, where the image is seen upright but reversed left-to-right.The eye-level finder is an evolution of the waist-level finder, using a roof pentaprism or pentamirror to correct the image while making it viewable through an eyepiece at the rear of the camera.