This sits atop your SLR and softens the light from the factory flash. It fits my Canon EOS XTi and also a Nikon SLR (unsure of model). Try different colors for the "screen" and see what happens!1] Print one of each piece, except "Assembly.stl" - that's just for reference. 2] Snap the screen into the box. 3] Place the box over your flash. 4] Insert the foot into the shoe on your camera to close the box. 5] Try it out!