This innovative and efficient design centers the bubble within a circle over your hot shoe. (Mind the input hot shoe cover direction) .You can easily see whether the bubble is centered, and this level takes up much less space than a large acrylic block! These will fit any camera with a standard hot shoe including, including those from Canon, Nikon,Panasonic, Olympus, Sony and Pentax. (It doesn't fit Sony cameras made before 2012.)