Telescope for Astronomical Telescope Outdoor Monocular Telescopes Portable1. Mount the telescope on a tripod, adjust the angle, remove the dust cover, and attach the eyepiece.2. Align the finder scope with the object, make it in the center of the field of view.3. Rotate the focus wheel slowly until see a bright, clear image.About Magnification: The focal length of the eyepiece, combined with the focal length of the telescope, determine the magnification . To calculate the of your telescope with any particular eyepiece, simply divide the focal length of the telescope (300mm) by the focal length of the eyepiece (indicated in “mm” on the eyepiece collar). For example, when you use the eyepiece H20mm with this telescope, the magnification will be 15X, and with a 3X Barlow lens, the magnification will be 45X.Specifications:Aperture: 70mmFocal Length: 400mmEyepiece: H10mm, H20mmPackage List:1 * Telescope Main Tube1 * H10mm Eyepiece1 * H20mm Eyepiece1 * Tripod1 * Storage Backpack Telescopes Adults Astronomy Compact Portable Travel Monocular Monocular Telescope High Power Monoculars Bird Watching Traveling Camping pocket telescope binoculars bird watching binoculars