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Gee, thanks for all your ideas and the welcome. I will follow up the leads given. I must confess I'm at work here in northern China so plenty of time for dreams. With the cold winter nights, we actually get to see some stars but for much of the time the air quality is very poor, at least where I am. No scope here. Headed back to Perth in a few days. I live in the hills, and over the years have noticed the night sky suffering more as the city expands. I saw the collapsible dobs in AS&T mag I took with me, such as the Skywatcher Flex Tube, which attracted me because it would occupy less storage space. Would the open sides be adversely affected by light for backyard watching? And does everything stay aligned ok just using two extension tubes? Thanks again, Theo
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