Question by LordWafflesロードワッフル: What are some tips on photography of Solar Eclipses?
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Answer by Curious
Solar eclipses may be easily photographed provided that basic eye safety precautions are followed. A mylar or glass solar filter must be used on the lens throughout the partial phases for both photography and safe viewing. Such filters are most easily obtained through manufacturers and dealers listed in Sky & Telescope and Astronomy magazines.
Almost any kind of camera with manual controls can be used to capture a solar eclips. However, a lens with a fairly long focal length is recommended to produce as large an image of the Sun as possible.
A standard 50 mm lens yields a tiny 0.5 mm image, while a 200 mm telephoto or zoom produces a 1.9 mm image. The focal length of 500 mm is most common among mirror lenses and will produce a solar image of 4.6 mm. Adding a 2x tele-converter will produce a 1000 mm focal length, which doubles the Sun’s size to 9.2 mm. BTW, focal lengths in excess of 1000 mm usually fall within the realm of amateur telescopes. a focal length of 1000 mm requires less critical framing and can capture some of the longer coronal streamers. For any particular focal length, the diameter of the Sun’s image is approximately equal to the focal length divided by 109.
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