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<blockquote data-quote="J-see" data-source="post: 417730" data-attributes="member: 31330">I wondered if it could not be the D750 because cold could easily affect it too but I have been shooting other lenses in much colder conditions than today and I never had the issue with any other lens. Admittedly, with a short lens doing landscape, it has to miss focus quite some before I'd notice. But when shooting my 200mm which is a PITA to focus, all is fine. It's only the Tam.The annoying part is that I can't find any reason that makes much sense. The temperature makes most but it's not as if I'm on the North Pole. If she couldn't handle cold for some mechanical reason, that information would be out there already since there are places much colder where the Tam is shot.I can understand how the mechanical part of their VR could lock up focus but why focus itself is inconsistent, I simply can't find any good explanation for. And without that, a solution is practically impossible. If I'd know this or that triggers it, I could work around it.</blockquote>

[QUOTE="J-see, post: 417730, member: 31330"] I wondered if it could not be the D750 because cold could easily affect it too but I have been shooting other lenses in much colder conditions than today and I never had the issue with any other lens. Admittedly, with a short lens doing landscape, it has to miss focus quite some before I'd notice. But when shooting my 200mm which is a PITA to focus, all is fine. It's only the Tam. The annoying part is that I can't find any reason that makes much sense. The temperature makes most but it's not as if I'm on the North Pole. If she couldn't handle cold for some mechanical reason, that information would be out there already since there are places much colder where the Tam is shot. I can understand how the mechanical part of their VR could lock up focus but why focus itself is inconsistent, I simply can't find any good explanation for. And without that, a solution is practically impossible. If I'd know this or that triggers it, I could work around it. [/QUOTE]

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