The SVBONY MK90 features a convex meniscus lens instead of a traditional Schmidt corrector plate, enhancing contrast and eliminating the need for periodic collimation, instant readiness for stargazing; each astronomical photography telescope undergoes precise optical axis alignment before leaving the factory; 3 screws for fixation; 3 pairs of calibration screws; enjoy immediately easy to use. The SVBONY SV131 1.25" Plossl 32mm Eyepiece uses premium optics that are fully multi-coated for crisp images. The folding eyecup lets you view with or without glasses, works well for views of the moon, planets, deep-sky objects and terrestrial observations. Use the SV221 zenith mirror to obtain an upright image and an upside-down image, with a brass pressure ring the SV221 diagonal mirror can protect the eyepiece from being scratched and not damage the service life of the eyepiece. The SVBONY 5x24 low power;wide angle telescope fixed to the body of a more powerful telescope and pointed in the same direction for initially locating an object to be observed. An adjustable focusing wheel is projected onto a non magnifying viewing window so you can aim the main telescope quickly and easily.