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Hi Kenny,

This is maybe the 4th or 5th binocular now that I have seen this. It is not the worst, but to me it is very noticable. In my opinion, it should not be present at all. I have many fine binoculars that don't show this off-center anomoly. I am as curious as you as to why this might occur!

edz

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This type of problem could be the result of an incomplete collimation process during end-control. They are checking whether both optical paths are parallel. If one of the prisms is mounted incorrectly, so that a small tilt remains, then, during collimation, they are tilting the second prism in exactly the same manner. Both optical paths are parallel now, but the images are slightly out of center. At high magnifications some coma might show up then (perhaps visible with a booster?), but at 7x these effects may remain invisible.

Maybe, Bill Cook knows more about what could be going wrong here.

Best,
Holger

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