Swarovski BTX Module EyepieceThe Swarovski BTX Module Eyepiece brings angled dual eyepiece viewing into the top quality optics level. Designed for the ATX STX modular scope series, the BTX reduces eye fatigue by allowing the user to keep both eyes open while viewing. Attaching the BTX to either the 65mm or 85mm objective module results in a 30x scope view, while attaching it to the 95mm objective yields 35x. There is no zoom capability available. Physical features of the BTX