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Grzybowski collimator
About 20 years ago I made a small alignment telescope with cross-hairs that can focus from a few inches to couple of metres. A few days ago I decided to turn it into a Grzybowski collimator, by adding the light sources and a 2" barrel to the front end.
Hopefully I will be able to use it to fix Andy01's TOA-130 problem.
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