The Swarovski TLS APO 43mm Digiscoping Lens for ATS/STS/ATM/STM/STR spotting scopes is a proprietary adapter used to connect a DSLR camera body with a full-size sensor to the viewing module of of the spotter, effectively using the scope as a lightweight, waterproof, super-telephoto lens. When the TLS APO, T2 adapter, and camera body are mounted to the spotting scope eyepiece, users are treated to a truly stunning digiscoping experience. The TLS APO has a 43mm lens that perfectly aligns the camera sensor with the focal plane of the transmitted image. Regardless of the camera used, you will capture contrast-rich and sharp video and still images using the premium optics of your Swarovski spotting scope. A camera and T2 camera adapter are required to complete the Swarovski digiscoping system, and are not included.