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Star tracking Index
To take photo's of the stars even modern digital camera's require exposure times from 10's of seconds to a few minutes or more. However any exposure over a few seconds, especially with a telephoto lens, will show 'star trails' (caused by the stars 'smearing' as the Earth turns). To take 'pin sharp' photo's requires a camera mount that counteracts the movement of the Earth. One such mount, known as a 'Barn Door' (or Haig Mount) is described here and can be constructed using wood-working skills (and can even be 'driven' by hand !)
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