MK90 Maksutov-Cassegrain Telescope is a compact and portable device, precision-calibrated through three processes, featuring a Vixen-style dovetail design, it offers ease of installation, enhancing your viewing experience. Maksutov-Cassegrain Telescope Innovation: The SVBONY MK90 features a convex meniscus lens instead of a traditional Schmidt corrector plate, enhancing contrast and eliminating the need for periodic collimation. The SV231 filter is specially used to correct chromatic aberration and color unevenness. It improves the color quality and contrast of the picture by eliminating chromatic aberration and enhancing color saturation. If you have ever been troubled by the edge chromatic aberration problem of your telescope, try this one, you may be pleasantly surprised. Optical density is greater than 4. It can effectively block light damage and reduce noise. Standard 1.25-inch astronomical filter size specifications: meet the needs of telescopes of different apertures and cameras with different target surfaces. SV705C telescope camera is not only for planetary imaging; but also very powerful for EAA and lucky imaging; entry-level deep sky shooting; suitable for EAA enthusiast crowd; Compared with IMX485 sensor; IMX585 has 3 times the number of full well charges; and has a very high signal-to-noise ratio; which can improve users' shooting efficiency and capture outstanding celestial images.