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[QUOTE=multiweb;1383653]Looking at your lens design I'd keep the warmers at the end where the glass is then wrap the rest of the exposed length with a layer of socks. It's likely it shortens when it gets cold.
Yep. There is a lot of steel and glass in that lense. More than 2kg of it. Need to get the gloves on to touch it at after a few hours at 7 degrees so shrinkage could definitely be a factor. Maybe 0.3 mm.
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