The DEMO Swarovski ATS/STS Spotting Scope Eye Piece delivers 25x to 50x magnification and an impressive wide-angle view. This eye piece is both unique and innovative, featuring an a spherical lens that offers edge-to-edge image clarity in a variety of conditions. If you are looking for a powerful eyepiece that won't weigh you down, the DEMO Swarovski ATS/STS Spotting Scope Eye Piece weighs only 10.4 ounces. In addition to its lightweight design, this eyepiece features 17mm of eye relief for comfortable viewing and a 25 percent increase in field of view along the entire magnification range.