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Refractors don't have secondary mirrors (like SCT), so there are no collimation screws. The only "collimation" they require is the alignment of the front objective lens and this is usually done in factory.
But I am not an expert on refractors, so don't know if you can collimate by yourself or have to get them done professionally.
I heard that refractor VERY rarely, if ever, need collimation if they are handled correctly.
Bo
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