北美洲星雲

C.L.Chan

8月14日凌晨再影一輯 , 用盡變焦鏡的200mm焦距.
天鵝座亮星天津四(右) 及北美洲星雲 (左). 星雲受其附近的恆星的紫外線激發 , 發出紅光 , 呈現北美洲的地貌 .
North America Nebula and bright Star Denbe. 2018 08 14 HKT 02:10 to 02:24 Canon 700D Camera, IR filter removed. Canon EF 55-200 set at 200 mm, F/5.6 , White Balance set at Sun light. ISO 6400, Exposure 60 sec. each. Use Deep Sky Stacker software to stack 15 light frames, 10 Dark frames & 10 Bias frames. Total exposure is 15 minutes. Place where the photos taken is台灣大雪山 .