SVBONY SV503 102mm F7 refractor telescope delivers crisp, high-contrast views of planets, galaxies, and nebulas. ED lenses reduce chromatic aberration, while the 360° rotation focusing wheel and dual-speed focuser provide ultra-precise adjustments for backyard astronomy enthusiasts and astronomers.he SV220 dual-band filter is designed for astrophotography of emission nebulae, planetary nebulae and supernova remnants. The high transmission and sharp cut-off greatly enhances the contrast of image and brings out the most detailed information of those deep-sky objects.SV193 2" 0.8x focal reducer and field flattener for refractor telescopes, which can meet the illumination needs of full-frame shooting. With SV503 102ED refractor telescope, it can take dazzling celestial photos without worrying about the distortion of the star points on the edge of the photo.SV226 filter drawer adopts integrated CNC molding and anti-light leaking design. It can compatible with 1.25" & 2" specifications filters on the market. Strong magnetic attraction, prevent the filter from falling off.SV211 Handle Bar is a comfortable and convenient carrying handle, After the combined installation, the large-aperture telescope can be easily carried and moved.