Assertion: collimator's problem | /r/CapableOf | take some practice
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text: SightTube Autocollimator 2" model only 2", 2" short f/ratio (f/3-4.2) and 1.25" models 2" and 1.25" models Very intuitive in use, can also diagnose non-collimation problems Takes some practice Takes some practice Uses batteries (2 AA) no batteries no batteries requires a center spotted primary mirror requires a center spotted primary mirror requires a center spotted primary mirror requires a temporarily center spotted secondary mirror no secondary mirror center spot needed no secondary mirror center spot needed good collimation accuracy good collimation accuracy excellent collimation accuracy $144.00 $49 (1.25")