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the Longest solar FIlament
While observing the Sun on 8 Feb 2015 using a 90mm Double-Stacked Coronado Solarmax telescope, a huge filament stretching almost the diameter of the Sun was visible. The observing eyepiece was quickly replaced with a high-speed monochrome camera and fortunately, the seeing conditions were good resulting in this beautifully detailed photograph. A couple of days later, NASA announced that the filament was the longest one ever recorded.
Telescope: Coronado Solaarmax 90mm Double Stacked.
Mount: Software Bisque Paramount MX
Camera: PGR Grasshopper 2
Filters: Not applicable (Double Stacked Etalons)
Exposures: 120 seconds of video