Takahashi BRC-250(CST)　Bitran BT-218ME camera
IDAS TypeIII LRGB filter L6x10min. R3x5min. G3x5min. B6x5min. RGB(2x2)
LRGB

NGC5457 (M101　Galaxy in Ursa Major)
14h03m12.7s +54 21 12 Mag.(V)7.9 Dim' 28.8x26.9 SB14.9 SAB(rs)cd I