彗星 46P

C.L.Chan

200mm 鏡頭下的彗星 46P.
Comet 46P/ Wirtanen, 2018 12 18 HKT 01:56 to 02:07 Canon 700D Camera, IR filter removed. Canon EF 55-200 set at 200 mm, f/ 5.6, ISO 3200, Exposure 10 sec each. RAW format is using. Use Deep Sky Stacker software to stack 45 light frames, 10 Dark frames, 10 Bias frames and 10 Flat frames. Color curve, brightness & contrast adjustment by GIMP. Total exposure is 7.6 minutes. Atmospheric Transparent :5/10, Seeing :7/10. Place where the photos taken is Kennedy Town, Hong Kong.