For hand-held it would have to be 7x50 or 10x50, but the problem then is, you don't have the extra aperture or magnification to *really* assist you with DSO hunting.
I've got 11x70's, and you can hand-hold them but they are very difficult to keep steady, so anything you find is going to be wobbling about. You really need a bino adapeter for your tripod (about $15) and then you can go larger.
But make sure you have a good quality tripod - any cheap camera tripods just won't handle the weight and the locking mechanism on the head will fail you.
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