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Motorised star tracking

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 !)

The pages in this topic are :-

  + Introduction to autotracking

  + Basic motor control

  + Gearing and control

  + PWM motor control

  + Retrofitting in practice

  + Telescope remote control == Latest changes (modified 29th May 2018 14:43.)

Next page :- Introduction to autotracking