New 1.25&rdquo; Astronomical Telescope 10mm Phone Eyepiece Adapter for Samsung HTC Smart Phone Focal length: 10mm;Standard 1.25 (31.75mm) fitting diameter to the scopes eyepiece holder Built with metal material,more stubborn;Great for imaging or displaying the live view to a group This product can be used for connecting the mobile phone with the astronomical telescope to make the observed object display on the full screen of the mobile phone and to take photos and videos by the mobile phone The universal phone holder allows you to mount a range of different smart phones on the tripod. 7*24 hours customer service,please buy with confidence:)