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Hi Bob, the plastic washers sit between the spider hub and secondary mount. The collimation screws bear against the plastic washers. It makes rotating the secondary a bit easier for collimation. Being a Newtonian there isn't really any false colour apart from what comes from the eyepiece. At F5 there is a bit of Coma. It's not the greatest planetary scope in the world obviously, I really use it for low and medium power views of bright nebulae and open clusters which it does pretty well.
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