I already have a pair of Canon IS binoculars and find the batteries run down quickly so I was looking for something that would give me a stable image without using batteries. The only thing I found were these 20x50 from Newcon. All the specs looked great so I ordered them. When they came I took them outside to see how well they worked. The following is what I found: 1. The unit produced two side by side images that I couldn't correct (I found out later when I called customer service that this was a jarred prism issue and easy to fix back in their shop). 2. There was a lot of color around all bright objects. This means excessive chromatic abbreviation which is an indication of very poor quality optics. 3. There was no center focus as advertised. The focus was individual for each eye. This made it extremely difficult to switch between close and far objects or even to follow an object that was moving toward or away from you. These would not make a good unit to watch/follow birds with. 4. The right eye lens focus would focus an object fair but not as sharp as my Canon IS binoculars would (I could see the numbers on a high altitude plane with the Cannon and with the Newcon the wings were fuzzy and there was no hint of any numbers). 5. The left eye lens focus would not come to a good focus at all (not even as good as the right focus which was very poor at best). The image through the left eye lens was not only very poorly focused it was also dimmer than the image though the right eye lens. Something very bad was wrong with the left side optics. 6. The unit would stabilize a moving image (not rock solid like the Canon IS unit would) and the image seemed to swim slowly back and forth but this wasn't very bad and I could get use to it. 7. The image stabilization became erratic for objects that were above 45 degrees in elevation. The unit failed to stabilize at all for objects above 70 degrees elevation but instead would 'click' and then the image would snap to one side and then it would 'click' again and the image would snap to the other side and so on and so on over and over... I bought these for Astronomical use (at night at high elevation angles) to replace my Canon IS unit as it goes through too many batteries.