Swarovski's SSC80 80mm Objective Tethered Spotting Scope Cap offers a high degree of protection for the objective lens on your 80mm STR / ATS / STS / ATM / STM scope. It installs easily without tools or modifications to the scope by simply screwing it to the filter thread. This design allows you to instantly raise and lower the cap and since it's tethered to the housing, you won't have to worry about losing it. There is a second thread on the cap housing to mount lens filters.