If you get tense about fine sand in the Middle East, then you might as well leave your scope in the box, because the stuff is everywhere. As long as you don't view in particularly windy weather, however, the sand is actually not too much of a drama, and I just give things a dust down with a blower at the end of a session. Better to be out and observing rather than worrying too much about your gear. Most nights are pretty still, I've found, and we had a nice still night for viewing, maybe getting down to 18 or 19 degrees, and dew was no problem.
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