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Message: <blockquote data-quote="nickt" data-source="post: 495681" data-attributes="member: 4923"><p>I don't recall seeing a shift like that when forgetting to turn off vr/os on my other lenses. Maybe I just wasn't paying attention or maybe Sigma's behave a little differently on a tripod. At 600mm, around 100 feet out, I was shifting about 1 foot off target. Looks like yours is a similar shift for the distance involved. In my OS mode 1, it was a 45 degree slide down to the right, in mode 2 it was just straight down. After hitting maximum shift, it would snap back. I was just pushing my back button focus and observing at that time. Pictures I took did have various amounts of shift. Now that I know what it is, it will end up being a great reminder that I forgot to turn os off when on the tripod.</p></blockquote><p></p>