SV137 1.25 inch 3x Barlow Lens triple the power of any 1.25 inch telescope eyepiece its used with. High magnification for eyepieces to see more details of the moon and other planet Ideal for high power observation Provide a high power magnification SV137 1.25" 3x achromatic barlow lens effectively triples the magnification of each eyepiece,allow you look more closely and more detailed of your observation target More magnification for existing eyepieces to see the details of moon and bands of Jupiter clearly;the Barlow lens is a must NOTE,Each telescope has its own maximum capability of the telescope optics.And after the maximum, image get blurred.The Maximum usable magnification is usually twice the aperture of a telescope. For example,you get a 60mm aperture telescope ,then the maximum usable magnification is 120x. Features: When the Barlow lens and eyepiece using together;if the magnification is over the biggest magnification;the Barlow lens observation effect appears nearly zero or imaging becomes blurred In order to reduce the influence of imaging;careful selection of Barlow lens at different magnification is very important SVBONY universal cell phone adapter mount makes it easy to position a point and shoot for high magnification photography Make your mobile phone into a video camera and images capturer;so that you can explore the nature world easily through the screen Operating tips Mount the adapter on the phone or spotting scope;screw the top knob into the end Align the center of the cell phone camera and the center hole of the adapter;then tighten the phone Open the cell phone camera;slowly insert the adapter;tighten the eyepiece clamp when the image is clear Double click the phone screen to enlarge the image to the full screen Pay attention Please make sure that the outer diameter of the eyepiece is between 25 to 48mm