Quote:
Originally Posted by ballaratdragons
not sure about others refractors but you can collimate ED's when they need it. The collimation on ED's is done by slightly loosening the 3 screws holding the focuser in, and moving the focuser body, then re-tighten the screws.
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Sorry mate, but what do you mean by 'ED's', and I don't suppose you have a picture to make it even clearer, by any chance?