This may be the longest photographic exposure ever taken: An 8-year image of the Sun's path through the sky, taken with a pinhole camera made out of a beer can. herts.ac.uk/about-us/media
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Lots of great background information in this thread, including a photo of the beer can used to take the world's slowest photo.
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What may be the longest exposure photograph in history was taken at Bayfordbury Observatory over 8 years - using a pinhole camera made from a drinks can. twitter.com/UniofHerts/sta…
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If you want to make your own solar camera out of a beer can (or soda can), here are step-by-step instructions:
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These are some taken by Michael Wesley. They mostly vary between ca 1 to 3 years in terms of exposure length.
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Love the two here that make it look as if we're living on a ringed world!
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I'd never heard of beer can pinhole cameras until today and all of a sudden it's a flood [OK, two] of fascinating ideas
eyeofthetynephotography.co.uk/myblog/solargr
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