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Message: <blockquote data-quote="Kevin Purcell" data-source="post: 1353603" data-attributes="member: 68323">Owen: try this:0. set the diopter to 0 (I assume its on the right eye)1. Mount the bin on a tripod and aim it2. Cover the right objective with the cover3. With your left eye focus on a distant (several hundred meters) sharp target.4. Uncover the right objective5. With your LEFT eye look through the right barrelDo you need to tweak the focus control to get sharpest image? If you do then the diopter setting has an offset. If it is offset go back and do the same procedure but instead of using the focus set the diopter setting (using your LEFT eye on the right barrel).This should tell you how far off the diopter setting is.Being off can be annoying (as shows not enough attention was applied when making and testing it) but so long as it's in range it will work for you. Or you have the solid evidence you need to send it back.The 10x versus 8x is another matter <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />If the dipter setting is not on the right barrel flip left and right above.</blockquote>