You can try this at home, IF you have the right equipment. You will need a tripod, camera with manual exposure settings, manual film advance, and a GOOD QUALITY solar filter. Use low-to-medium film (ISO 50 to 100).
About this photo (quote from David Malin):
The trusty Hasselblad was set on a tripod with the 80mm Planar lens set to f/16. It was loaded with 200 ISO Ektachrome because that's all I had. It was also fitted with a neutral density filter with an attenuation factor of 10 million (equivalent to ND 7), made simply by mounting Wratten ND 3 and ND 4 filter gels together in a screw-on filter mount.
The shutter was opened before the sun appeared in the frame and was left open all afternoon, probably five hours. Once the sun had set, the shutter was closed, the ND filter removed and, without winding-on the film, a short exposure was made of the after-sunset horizon, probably 1/25 at f5.6 or f/8. The flares around the sun trail are where it passed behind high cloud and they are greenish because the Wratten filters are not truly neutral and even the slightest colour cast would be evident with this amount of ND over the lens.
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