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Stefan
Are you talking about your 130mm newt in your sig? if so I think it is an f5?
The pic you mentioned shows "offset" when using a Cheshire collimator. Offset is needed aspecially with fast scopes to ensure the secondaty intercepts the light cone from the primary without losing any light. It is certainly a good idea in scopes faster than f5, but for a 5" f5, probably not worth worrying about.
The other question is how are you doing collimation up to the point of using your laser?
Malcolm
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