The X-Cel LX Telescope Eyepiece Astrophotography Adapter from Celestron provides a solid attachment of your Samsung Galaxy S4 and allows you to use your phone camera to take photos or videos of your favorite near and deep space celestial bodies or events like meteor showers through our telescope. When you are ready to take photos, simply attach the ring to the case and slide it onto the eyepiece of the scope. This adapter is designed to keep your smartphone camera aligned with telescope optics every time you attach it.