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Message: <blockquote data-quote="Kevin Purcell" data-source="post: 1354020" data-attributes="member: 68323">So those results are consistent with the original observations.The final thing to check (the EO people may have already tried it) is is the diopter ring actually centered correctly i.e they haven't put the thing on at an offset angle.Check by moving to the diopter ring to the end stops ... are they symmetrical about the zero?The only disadvantage of having built in offset is on resale when you sell to someone with two different eyes and no astigmatism who doesn't like to wear glasses with bins. They might not be able to null out the difference.Regardless I'm glad you're happy with these bins.BTW, I got a free ($29 value!) Audubon 8x40 from Camera Land with a Stokes Sandpiper. The bin isn't bad given it's not waterproof and made from plastic the single MgF coated optics is actually OK in collimation. But the diopter offset (with click settings!) was so bad it need to be fully to an end stop for the bin to be zeroed.So I guess that's a worst case. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>