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The optical performance of most Newtonian telescopes can be optimized by collimating, or realigning, the telescope's optics as needed. This procedure's easily accomplished with Celestron's collimation tool, a handy accessory that comes with detailed instructions and is listed here.
In the Box
Celestron Collimation Eyepiece (1.25") - Allows the Realignment of Newtonian Telescope Mirrors