Swarovski Optik 1.7x Magnification Extender for ATX/STX/BTX Spotting ScopesSwarovskis ATX STX BTX spotting scope system combines a versatile modular system with high definition lenses to create a spotting scope that can be modified to suit your needs while maintaining high quality optical performance. This new Swarovski Optik ME 1. 7x Magnification Extender is designed for use with the ATX STX BTX system and substantially increases magnification power when incorporated into the spotting scopes optical system. Benefits The