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Message: <blockquote data-quote="pshute" data-source="post: 2856023" data-attributes="member: 59235">I've got a cheap pair of 8x21s that do that. OK for any use where the subject is usually the same distance away (horse racing?), but very frustrating for birding. I'd like to know if this one has a technical term, and it would be good if it was mentioned in specs so it could be avoided.I haven't noticed that in my Nikon Monarchs (roof), but it happened with my Bushnell Legends (porro), especially in the cold. I used to just rock the bridge a few times to fix it, or overshoot the focus and come back from the other direction.I used to fiddle with the dioptre on the Bushnells all the time, thought my eyes were varying. I haven't touched it on the Monarchs since I got them.</blockquote>