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. Correct upside down and left right reversed image. It will look like trying to read a sign in a mirror. Suitable for space viewing, for there is NO upside down or right side up in space. Brass lock Screw for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching.