The Swarovski 20-60x Eyepiece is a Module that attaches to your ATS/STS Spotting Scope bodies. Swarovski does it a little different than most manufactures by allowing you to interchange your eyepieces with your bodies (models depending). This enables a whole world of options instead of being stuck with a single option. The Module is waterproof, fogproof and only weighs in at about a little over half a pound. This is ONLY the eyepiece so make sure you also pick up a Spotting Scope Objective lens to complete the setup.Features:Made specifically for Swarovski ATS/STS and STR Spotting ScopesSWAROTOP and SWAROCLEAN Optical CoatingsLong 17mm Eye ReliefO-Ring Sealed, WaterproofTwist-Up Rubber EyecupWaterproof & Fogproof