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Old 03-09-2017, 04:46 PM
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Steffen
Ebotec Alpeht Sicamb

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Join Date: Feb 2010
Location: Toongabbie, NSW
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For that purpose I would suggest a TuBlug, which can be used with any laser. It contains a negative lens and fans out the beam – what you centre around the hole in the screen is not the return beam but the shadow of the mirror's centre marker. That's why this method is largely unaffected by mis-collimation or poor fit of the laser.
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