Photographing solar eclipses is one of the most challenging forms of astroimaging. It requires a great amount of advanced planning, from organizing the equipment you tow along on your voyage towards totality, to recording a series of exposures that capture the huge range of brightness displayed by the Sun's ethereal corona. It's even trickier if you hope to reveal complex magnetic loops that are hidden within the corona. Fortunately, digital photography has made this type of high-dynamic-range (HDR) imaging a bit easier. Here's a technique I use with Adobe Photoshop that works on solar eclipse photographs taken through most any lens or telescope.
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