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Message: <blockquote data-quote="Kevin Conville" data-source="post: 1638386" data-attributes="member: 63161">For most any applications you are likely to be using it for, the 6x should collect about as much light as the 8x. In theory, the 8x20 will have better performance in the lowest of light (twilight factor) but that's not these thing's forte anyway.IMO there are other good reasons to choose the 6x though. Smaller size and weight, much wider field of view, and most useful, a greater depth of field. The last issue minimizes re-focusing which is helpful with these things, for quick handling. The 6x will lessen shake as well, which I find important as they are not the easiest optics to hold steady.As a point of reference, I have a Nikon 5x15HG and find it about right, for the above reasons.</blockquote>