SVBONY 45-degree erecting prism transform your telescope into a telescope for nature observation,easily correct upside down and left-right reversed image; Eyepieces focal length;0.16" 4mm;offer high magnifications;look more closely and more detailed at the moon's surface and other planet; for viewing the moon and planets Standard 1.25'' 31.75mm fitting diameter; 2x barlow lens magnification with 1.25" interface;