I can easily hold 4 stops with the current 16-35mm F4 VR II Here is one at 29mm half a second shot. This was actually done for a challenge. No tripod was allowed. One time I handheld Sigma 70-200mm OS with 1.4x TC 4 stops. Sigma uses Nikon VR for their OS. That is why Nikon is suing Sigma. If I can get this lens for about $1100 ( I don't care about tripod collar) I will be first in line. I think Nikon is kicking everyone's ass lately. So 5 stops will not be a big surprise for me.