Swarovski BTX Eyepiece: A COMPLETELY NEW VISION. A new era of functionality: The ATX/STX/BTX telescope system combines exceptionally flexible modularity with optical perfection. By changing the objective module, it can be individually adapted to any observation situation. Extreme detail recognition at crucial moments thanks to SWAROVISION technology and the simplest operation ensure fascinating experiences in nature. The BTX combines the vision of both eyes for a revolutionary viewing experience. Crucial details become visible with the brilliant optics; no detail remains hidden. The forehead rest and angled eyepiece guarantee hours of comfortable observation. The BTX eyepiece module combines the advantages of binoculars and a telescope. It provides vivid and natural images and the necessary comfort for long-term observations. The BTX eyepiece module is compatible with all objectives in the ATX/STX series from SWAROVSKI OPTIK.