My first experience, and only so far is with a pair of 7x50 binos.
My favourite targets were the moon, southern cross/jewel box, Southern Pleiades and Omega Centauri. You dont see much with Omega Centauri, just a glowy smudge in light polluted skys, better in dark sites. I always liked the Pleiades though, beautiful.
Im about to buy a new pair of binos when I buy my scope. I found the 7x 50 pretty comfortable to hold for long periods, I may go to 10x50s but any bigger , a tripod is the way to go I think.
As far as least powerful possible to see anything, any pair of binos will allow you to see so much more than with your eyes. Even a little pair of 8x25s are better than nothing. Once someone has started strolling around the stars with a little pair of binos, more tham likely , their curiosity will be piqued.
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