Designed for the ATX/STX/BTX family - The ME 1.7x magnification extender increases the magnification by a factor of 1.7. Swarovski ME 1.7x Magnification Extender Ever closer The ME 1.7x magnification extender increases the magnification by a factor of 1.7. You can quickly and easily attach it using the bayonet catch to all the objective and eyepiece modules in the ATX/STX/BTX family. In the case of the BTX 65 and 85, the magnification increases from 30x to 50x, and from 35x to 60x for the BTX 95. EVER CLOSER Innovative and perfectly tailored accessories not only enhance the capabilities and functionality of your SWAROVSKI OPTIK spotting scope, they also help to protect it. User-oriented concepts and design both play an important role.