GSO 1.25" Collimator Dust Cap

  • Used for collimating Newtonian telescopes
  • Fits 1.25" focusers

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Put this Collimator cap on the focuser, then rotate it so that its slot faces the light path. Then see through the slot. If all circles, seen through the collimator, are concentric, then the telescope is collimated. Otherwise it can be collimated by adjusting mirrors' screws.

Card Code8001510491

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