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Thanks guys.
It didn't occur to me until I was writing, that the battery case could be for the fan. And I am relieved to hear that the shape of the tube wasn't likely to be a problem. I thought so, because when I see truss scopes I was initially floored by the idea of all that open space letting light in, whether with a shroud or not, or even that stringscope idea someone made. But I thought I'd check.
Tonight should be a good chance to see Mars. I made it out as I came home, to the north /-west. Apparently the moon is out too, but it is too low on the horizon to see (I mean Starry Night Pro has it at about 20 alt, but I didn't notice it to the southwest.) Scattered cloud and moisture in the air in Melbourne. Should be interesting.
Phil
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