Swarovski BTX Eyepiece Module - Crucial subtleties can be seen with the crystal clear optics, with every detail now fully on show. A forehead rest and angled view guarantee comfortable viewing for hours on end. The benefits of binoculars and spotting scopes are combined in the BTX eyepiece module. It presents vivid, true-to-life images and offers the comfort required for long-term observation. The BTX eyepiece module is compatible with all objective lenses in the SWAROVSKI OPTIK ATX/STX range.BTX spotting scope system combines exceptionally flexible modularity with optical perfection. The objective lens can be changed to suit any viewing situation. Extreme detail recognition at crucial moments thanks to SWAROVISION technology and total ease of use ensure fascinating experiences in the great outdoors. Length: 6.9 inWeight: 50.0 ozFunctional temperature: -13 °,F to +131 °,FStorage temperature: -22 °,F to +158 °,FSubmersion tightness: 13 ft