The Vortex Universal Digital Camera Adapter is really universal. This camera adapter will attach most 3-4x optical zoom digital cameras to a wide variety of spotting scopes, as a bracket/platform for through-the-eyepiece photography. Simply attach the bracket to the scope, and then fix your camera on the platform, adjusting the camera lens so that it is in front of the scope’s eyepiece. The small size fits on spotting scope eyepieces with an outside diameter of 28mm to 45mm. The large works on a variety of spotting scope eyepieces with outside diameter measurements of 43-65mm.