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Message: <blockquote data-quote="Cluster" data-source="post: 3136492" data-attributes="member: 105217">Perhaps it's the same thing that I have seen on more than one new binocular, a donut shaped sweet-spot, just as you describe. Having set up the centre of the view for the best focus and sharpness, panning away from the focussed object I see an improvement in the contrast/sharpness then it softens as usual.     My present Hawke Endurance has a hint of this, one of two that I bought, I kept the donut sweet-spot shaped one because this gave (by far) the widest sweet-spot.  I returned a 7x42 for this as it was too noticeable in one barrel. the replacement that they sent to me was identical. Now thinking about it, I'd bet that it was the same one returned. That went back too.   Dave..</blockquote>