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Author Message   Winfried Rating: N/A Votes: 0 Posted on Tuesday, January 04, 2005 - 03:14 am:    You will find a description of the focus check method here: https://kyp.hauslendale.com/classics/collimator.html If the lens does not focus to oo, loosen the focus ring, turn it a bit backwards, tighten it and try again. If the lens is in focus now at a certain position of the focus ring, DO NOT turn the focus ring any more while it is tightened. Loosen it again and turn it against the oo stop.