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Its the primary baffle tube on the RC8. How old is the telescope? If it is a second hand or older scope, you will need to get the baffle tube extension from a supplier. Or you can remove the baffle and line it with a black felt from Spotlight. That is what I did to get rid of the problem. It was a problem in the original RC8's but was subsequently fixed with properly baffle edges and a slightly longer baffle.
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