Swarovski ME 1.7x Magnification Extender. Designed for the ATX/STX/BTX family, this extender increases magnification by a factor of 1.7. It attaches quickly and easily using a bayonet catch to all objective and eyepiece modules in the ATX/STX/BTX family. For the BTX 65 and 85, magnification increases from 30x to 50x, and for the BTX 95, it increases from 35x to 60x. Innovative and perfectly tailored accessories like this enhance the capabilities and functionality of your SWAROVSKI OPTIK spotting scope.