One other important point Nathan, if you buy a new Skywatcher Esprit ask the shop if it's a recently produced model, preferably made in 2015-16. Some of the early Esprits had problems with the mounting of the lens elements giving very uneven star halos in images.
On the other hand, if you did get a bad one it shows up easily in a 30 second image of a bright star and the dealer or Tasco (skywatcher distributor for Australia) will replace it.
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