4分鐘M42 大星雲

C.L.Chan

獵戶座 M42 大星雲 , 因城市煙霾很重 , 只能拍每張30秒鐘, 共疊了8張 , 總長4分鐘.用了平場鏡 , 光污染濾鏡  .

OrionM42 Nebula,  2018/03/09,  HKT 20h33-40m , Telescope:Astro Physics, Star 12 ED, D=12cm, F.L.=102cm, Prime Focus with flat field lensand Astronomik light pollution filter, Losmandy G-11 Equatorial Mount withmotor drive. Manual object targeting. Canon EOS 700D Camera , IR Low pass filter removed.  ISO1600, 30 sec exposure. CRW Format. Lightframes 8x/11, Dark frames 10x, Bias frames 10x, flat frames 10x. Stacking byDeep Sky Stacker freeware and post-processed by Microsoft photo . AtmosphericTransparent :7/10, Seeing :7/10.  Equipmentborrowed from Mr. Ng. Taken at Kennedy Town, 堅尼地城Hong Kong .