The ATX and STX modular eyepieces from Swarovski provide unmatched flexibility and work seamlessly with the ATX/STX modular objectives (sold separately). With twist-out, removable eyecups, the eyepieces offer a wide field of view for all users, whether they wear glasses or not. The focus ring is strategically placed for easy one-handed operation with any combination of objective and eyepiece.For the growing number of digiscoping enthusiasts, the ATX/STX eyepieces are designed to accept adapters, allowing users to capture stunning images through the high-quality fluoride-containing HD lenses. The modular design makes the ATX/STX spotting scope the most compact on the market, perfect for travel and easy to transport.Please note: This listing is for the eyepiece only. A separate Swarovski ATX/STX modular objective must be purchased for use with the eyepiece.