Swarovski digital camera adapter is for all Swarovski S series eyepieces. It mounts quickly and ensures the perfect alignment of eyepiece and camera every time. Four different sizes of adapter rings with thread mount sizes of 28mm, 37mm, 43mm, and 52mm are included to fit digital cameras to the digital camera adapter. Requires the Swarovski DCA Adapter Sleeve for AT/ST Scopes to fit older model AT-80 and ST-80 Swarovski spotting scope eyepieces.