2018 March 21 Sun - filament near NW limb
This dark filament is the only visible feature on the solar disc.
Telescope: AP Starfire EDT 155 mm f/9.
stopped to 80 mm (f/17.5) for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: ASI1600MM, 4656X3520 pixels (3.8 micron), binned 2
North is up, east is to the left.
2018 March 21 Sun - filament near NW limb
2018 March 21 Sun - filament near NW limb
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