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Message: <blockquote data-quote="typo" data-source="post: 3598380" data-attributes="member: 83808">Bob,Not a straight forward question to answer. Resolution and sharpness are two different binocular properties that are related by contrast at different spatial frequencies. Resolution is perhaps the more straight forward to pin down. Not to get too tecnical it's the last readable line on the opticians chart or the USAF line chart and is roughly when the pattern contrast falls to 5%. Once you know what to look for it's quite staight forward to find natural targets which will tell you if a binocular is better or worse than another. Sharpness is more to do with the level of contrast at the spacial frequencies the brain processes most efficiently. The angles subtended by the bands of different sized shingle were just a fairly persuasive demonstration of the sharpness advantage the Bonelli had over my ZR Prime and Paddy's FL. It's a property that shouldn't, in theory, go hand in hand with resolution but those other binoculars I scored as 10 were very sharp as well.David</blockquote>