I have the Orion Little Giants 15x70. Good stuff. They weigh just under 3 lbs. The 80mm were over 5 lbs. I thought that might be a bit heavy for extended hand held use. They were $279 and well worth it. There are better brands of binos if you want to spend more, smaller if you want to spend less. 50mm is about the smallest for serius astronomical use. Fuginon, Miyachi(spelling?) all very expensive. There is a pair by ProOptic, only sold at Adorama camera in NYC. They run about $100 than the Orion. You cna find their ads in Astronomy of S&T magazine. I saw the 10x70, didn't like them. Also saw the 20x80, very nice, just about the same price as my 15x70 but heavier. If you want to get a good mount to go with them, go to Universal Astronomics. You can find them and lots more at www.astronomy-mall.com
That's it;
BOB SAL