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UPDATE
The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being. I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure. ------------------------------------------------------------
Canon Rumors - Your best source for Canon news, rumors and creators
Dude had a shoot ruined by the IS on his Sigma not really being off:
https://petapixel.com/2018/03/08/sigma-art-lens-messed-ferrari-photo-shoot/
"A few days later, I had a chat with SIGMA service personnel. They explained to me that even though you switch stabilization on the lens (OS) to off, it doesn’t actually mean it’s off… The stabilization element is kept in its position by a magnetic field. Whenever the camera goes to sleep, the element moves down. After waking up the camera, it takes a moment to reposition itself to the proper position. And it’s even doing this during exposures!"
- A
https://petapixel.com/2018/03/08/sigma-art-lens-messed-ferrari-photo-shoot/
"A few days later, I had a chat with SIGMA service personnel. They explained to me that even though you switch stabilization on the lens (OS) to off, it doesn’t actually mean it’s off… The stabilization element is kept in its position by a magnetic field. Whenever the camera goes to sleep, the element moves down. After waking up the camera, it takes a moment to reposition itself to the proper position. And it’s even doing this during exposures!"
- A