在天台用長焦鏡頭拍星雲
首次在天台用長焦鏡頭拍銀河中的星雲 .M8 & M20 area, 2015 Sep. 5 , HKT: 20h48m to 20h54m, Canon ESO700D, IR Low pass filter removed. Canon Zoom LensEF 55-200mm, set at 200mm, ISO 3200, f/5.6 , Exposure 10 sec.for each frame. With motor drive HalleyEquatorial Mounting .Atmospherictransparent : 7/10, Seeing : 7/10. Processedand stacked by free soft- ware Deep Sky Stacker and Microsoft 2010 photo tool.Processed with 32 Light frames, 10 Dark frames, 10 Bias frames, 10 Flat frames.Taken atKennedy Town, Hong Kong.
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