SVBONY SV503 102ed 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. 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. The 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.