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Hi Stefan
Is this for your Celestron 130? I believe this is a newt? If so you really don't need a laser, just a collimating dust cap (I am not sure in Bintel still sell these.) or a film canister with a hole punched in the base.
With barlows, as with all optics, the rule is you get what you pay for, personally I would get good quality eyepieces first.
Malcolm
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