2013 October Sun - changes in 7 days

發表於 2013-10-8 11:09:53 | 顯示全部樓層 |閱讀模式

Telescope: AP Starfire EDT 155 mm f/9.
stopped to 50 mm for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: Imperx 4M15
North is up, and east to the left

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