TelVue 60mm F/5 ED refractor, 60mm Coronado H-alpha filter, Canon EOS digital SLR - taken during sun spot minimum in 2008
Sun, H-alpha Light
Amateur CCD Astronomy
By Richard D. Jacobs, M.D.
By Richard D. Jacobs, M.D.
TelVue 60mm F/5 ED refractor, 60mm Coronado H-alpha filter, Canon EOS digital SLR - taken during sun spot minimum in 2008