SV503 80ED telescope's objective lens features an S FPL-51 extra-low dispersion glass ED element, which virtually eliminates chromatic aberration. This results in the good color correction for an ED doublet lens.A thoroughly though-out design and high-quality mechanical components. This very special SV503 telescope provides astrophotographers, visual observers or nature watchers with bright, wide field views when observing starry skies or nature watching.SV503 80mm F7 astronomy telescope would be better begin for astronomy amateurs to do astrophotography.SVBONY SV230 super zoom eyepiece provides you with a wide range of magnifications all combined in a single eyepiece. It is convenient to observe planet. Wide angle eyepiece, expand the view of sight; Wider coverage, compatible with more brands; Output images without edge distortion. The aspherical lens is designed to eliminate edge distortion, it has resolved the persistent issue of subpar edge image quality associated with wide-angle eyepieces, thereby transcending the visual constraints experienced by users.