Mick you probably could, but the only concern that I would have is condensation or sweating if you like under the tarp with the changing temps.
If it was very cold at night, and the the Sun was out all day you would definitly get moisture under the tarp.
To help with this would be to first cover the scope in something like a toweling material and then put the tarp over that.
This would help absorb any moisture that may occur.
Leon
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