Useful Links

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• Andy's Shot Glass - Collimation Videos - Excellent, well presented website by Andy Raiford providing information for hobbyists on a budget. This link goes to his Collimation videos for Newtonian Reflectors.
  
  
• Observations on Newtonian telescope collimation - Newtonian collimation with lasers and using barlows in the Barlowed Laser Technique.
  
  
• Kendrick Astro Instruments - Laser Collimators - While this is a sales page for Kendrick Astro, it displays several types of Laser Collimators, and the Q&A section at the bottom of the page provides some very useful information.
  
  
• Skywatcher Telescope Star Testing Techniques - This page provides excellent graphics showing what a star test should look like, including errors such as poor collimation, abberation, coma, atmospheric turbulence, tube currents, pinched optics, astigmatism, zonal errors and surface roughness!