薄雲退去, 再拍太陽黑子
薄雲退去, 再拍太陽黑子,黑色的本影, 淺色的半影, 清晰可辨, Sunspot group in Solar Activity Cycle 25,HKT: 2020/12/01,13h11m Telescope: Astro Physics, Star 12 ED, D=12cm, Stop downto 80mm, F.L.=102cm, Prime Focus, Baddar film solar filter ND5. Losmandy G-11Equatorial Mount with motor drive. Canon EOS 700D camera, IR block filterremoved, ISO 100, 1/1000 sec exposure, jpg format. Stacking 20 frames &Wavelet by RegiStax 6, Final touch by Microsoft Photo, Atmospheric Transparent:8/10, Seeing: 8/10. Equipment borrowed from Mr. Ng. The location in this observationis Kennedy Town, Hong Kong 堅尼地城.
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