心宿二的光譜

C.L.Chan

心宿二的光譜

拆了舊的雙筒鏡, 取出一塊45度的三棱鏡, 放在 200mm的鏡頭前, 就可輕易拍得恆星光譜. 穩約看到光譜上的吸收黑線, 看來要更長焦的鏡頭來拍, 才可以更清晰.

The spectrum of Antares, 2021 07 08, HKT 23h17m, 45-degree prism place in front of 200mm lens, Canon 700D Camera set at ISO 1600, exposure 4 sec.