What is the most powerfull binocullers?

Answer 1

Binocular telescopes, with interchangeable eyepieces, can have a focal length as long as you like. Generally, any binoculars that advertise based on the magnification will be useless, as the picture quality will be unbearable. Also, binoculars with more than 15x can be hard to hold. It is better to get a good pair of 8 or 10 x binoculars with a larger front element.

If you really want though, it does not get much more powerful than this:

http://www.overstock.com/Sports-Toys/Full-Size-Zoom-Binoculars/2866058/product.html

120x