With a 90mm large aperture and 800mm focal length, SVBONY SV520 telescope collects more light, allowing for better observation of deep-sky objects. Compared to other entry-level products with a 70mm aperture, it provides brighter and clearer images. This powerful telescope is an ideal choice for astronomy beginners, featuring well-matched components and easy assembly. We've also created an installation video and offer dedicated technical support to help you get started with ease. The altitude-azimuth mount features a worm gear drive system, ensuring smooth and precise movement. With 360° horizontal and 90° vertical adjustment, it maximizes your ability to meet all observational needs. The package includes a K25mm eyepiece and a moon filter. You can also pair it with high-magnification eyepieces and other filters to meet a variety of observational needs. The SV135 is stiff enough not to accidentally change focus and smooth enough to rotate without having to hold the eyepiece base with your other hand. 7-21mm which will give you a wide range of magnification options. This is especially useful in lunar observing where one short barrel twist at a time will bring you closer, closer, and closer still to the Moon's craters and mountain ranges to the point where you get the feel of looking down at the lunar surface from an orbiting space station.