Takahashi BRC-250　Bitran BJ-41L
R5min.x5(1x1)　G5minx5(1x1)　B5minx5(1x1)
Tokai TYPEIII RGB filter　RGB

NGC6720 M57"Ring Nebula"Planetary Nebula in Lyra
18h53m35.2s +33 01 44 Diam76" Mag(P)9.7 Mag(V)8.8 Mag cent star15.2