Right Angle Viewing Attachments or Viewfinders
A viewing attachment can be attached onto your camera's eyepiece for unreversed image right-angle viewing. The attachment provides 100 percent viewfinder coverage from a convenient 90° angle. It is ideal for waist-level or low-angle photography as it is an attachment that extends upwards from the camera and you look down into it to view the image. The attachment is also ideal for close-up work or photomicrography and for working in limited space. The attachments screw into your camera. Most attachments can be rotated 360 degrees to provide viewing in any direction. Individual eyesight adjustment is also possible if the attachment comes with a built-in diopter.
Right angle viewfinders generally cost about $200.