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Hi Steve, I have not used the Nexstar or LX90, I have used the 8"Meade LX200 SCT and the 8" CPC Celestron SCT both with alt/az fork mount, optically I found they are very much the same and the Goto and tracking abilities similar, the Celestron C8 was a little lighter in weight and easier to lift, so being optically similar either would be good for viewing, but when it comes to Astrophotography there is a lot more to consider, I have sent you a PM with more details.
Wayne
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