"Good eye" on a term. As for the binocular size, mrbb makes a good point. A guy in a lot of brush wants something with a smaller magnification but not too small of an objective lens. If most of your glassing is at less than 200-300 yards, it 's hard to go wrong with an 8x42. 10X is usually for longer distance viewing. Now if you're scanning an entire side of a mountain, you might want something bigger like a 12x or 15x with a tripod. I don't think I would ever use a 10x25 as it doesn't sound like it's well balanced or thought out.